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20_MUL_2.8L_Duramax_Diesel_Engline_Supplement__COV_en_US_84186892A_2019MAY16.ai 1 5/16/2019 8:20:14 AM20_MUL_2.8L_Duramax_Diesel_Engline_Supplement__COV_en_US_84186892A_2019MAY16.ai 1 5/16/2019 8:20:14 AM

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-U.S./Canada-13336155) - 2020 - CRC - 5/6/19

Contents Introduction . . . . . . . . . . . . . . . . . . . . . . 2

Instruments and Controls . . . . . . . . 5

Driving and Operating . . . . . . . . . . 16

Vehicle Care . . . . . . . . . . . . . . . . . . . . 64

Service and Maintenance . . . . . . . 88

Technical Data . . . . . . . . . . . . . . . . . 96

Index . . . . . . . . . . . . . . . . . . . . 100


2 Introduction

IntroductionThe names, logos, emblems,slogans, vehicle model names, andvehicle body designs appearing inthis manual including, but not limitedto, GM, the GM logo, CHEVROLET,GMC, the CHEVROLET and GMCTruck Emblems, COLORADO,CANYON, and Duramax aretrademarks and/or service marks ofGeneral Motors LLC, itssubsidiaries, affiliates, or licensors.

For vehicles first sold in Canada,substitute the name “GeneralMotors of Canada Company” forGMC and Chevrolet Motor Divisionwherever they appear in thismanual.

This manual describes features thatmay or may not be on the vehiclebecause of optional equipment thatwas not purchased on the vehicle,

model variants, countryspecifications, features/applicationsthat may not be available in yourregion, or changes subsequent tothe printing of this owner’s manual.

Refer to the purchasedocumentation relating to yourspecific vehicle to confirm thefeatures.

This manual contains informationthat pertains to the operation of thediesel engine. It also contains theDiesel Maintenance Schedule. Thesections in this manual correspondto the sections in the owner’smanual. This manual, along with theowner’s manual, will assist you inthe proper use and maintenance ofthe vehicle.

Keep this manual in the vehicle forquick reference.

Canadian Vehicle OwnersA French language manual can beobtained from your dealer, atwww.helminc.com, or from:

Propriétaires Canadiens

On peut obtenir un exemplaire dece guide en français auprès duconcessionnaire ou à l'adressesuivante:

Helm, IncorporatedAttention: Customer Service47911 Halyard DrivePlymouth, MI 48170USA

Using this SupplementThis supplement containsinformation specific to the uniquecomponents of the vehicle. It doesnot explain everything you need toknow about the vehicle. Read thissupplement along with the owner’smanual to learn about the vehicle'sfeatures and controls.

Litho in U.S.A.Part No. 84186892 A First Printing ©2019 General Motors LLC. All Rights Reserved.


Introduction 3

Index

A good place to look for what youneed is the Index in the back of thissupplement. It is an alphabetical listof what is in the supplement, andthe page number where you willfind it.


4 Introduction

2 NOTES


Instruments and Controls 5

Instruments andControls

Warning Lights, Gauges, andIndicators

Instrument Cluster . . . . . . . . . . . . . . 6Fuel Gauge . . . . . . . . . . . . . . . . . . . . . 9Engine Oil Pressure Gauge . . . . 10Malfunction Indicator Lamp

(Check Engine Light) . . . . . . . . . 11Wait-to-Start Light . . . . . . . . . . . . . 12Diesel Exhaust Fluid (DEF)

Warning Light . . . . . . . . . . . . . . . . 13Power Take-Off Light (Chassis

Cab Only) . . . . . . . . . . . . . . . . . . . . 13

Information DisplaysDriver Information

Center (DIC) . . . . . . . . . . . . . . . . . 13

Vehicle PersonalizationVehicle Personalization (Van

Models) . . . . . . . . . . . . . . . . . . . . . . 14Vehicle Personalization (Pickup

Models) . . . . . . . . . . . . . . . . . . . . . . 14


6 Instruments and Controls

Warning Lights, Gauges, and Indicators

Instrument Cluster

English Base Level 4-Cylinder Pickup Shown, Metric Similar



English Uplevel 4-Cylinder Pickup Shown, Metric Similar



English Van Shown, Metric Similar



See the owner’s manual for warninglights and gauges not listed in thissupplement.

Fuel Gauge

Metric Base Level 4-CylinderPickup Shown, Uplevel Similar

English Base Level 4-CylinderPickup Shown, Uplevel Similar

Metric Van Models

English Van Models

When the ignition is on, the fuelgauge shows approximately howmuch fuel the vehicle has left in thetank. The gauge will first indicateE (Empty) before the vehicle is outof fuel, but the vehicle's fuel tankshould be filled soon.

An arrow on the fuel gaugeindicates the side of the vehicle thefuel door is on.

Listed are four situations customersmay experience with the fuel gauge:

. At the gas station, the fuel pumpshuts off before the gauge readsF (Full).


10 Instruments and Controls. It takes a little more or less fuel

to fill up than the fuel gaugeindicated. For example, thegauge may have indicated thetank was half full, but it actuallytook a little more or less thanhalf the tank's capacity to fillthe tank.

. The gauge moves a little whileturning a corner or speeding up.

. The gauge does not go back toE (Empty) when the ignition isturned off.

None of these indicate a problemwith the fuel gauge.

For information on how to fill the fueltank, see Filling the Tank 0 40.

Engine Oil PressureGauge4-Cylinder Pickup Models

See “Oil Pressure” under “DriverInformation Center (DIC)” in theowner’s manual.

Metric Van Models

English Van Models

Caution

Lack of proper engine oilmaintenance can damage theengine. Driving with the engine oillow can also damage the engine.The repairs would not be coveredby the vehicle warranty. Checkthe oil level as soon as possible.Add oil if required, but if the oillevel is within the operating rangeand the oil pressure is still low,have the vehicle serviced. Alwaysfollow the maintenance schedulefor changing engine oil.

The engine oil pressure gaugereads in kPa (kilopascals) or psi(pounds per square inch) when theengine is running. Oil pressure mayvary with engine speed, outsidetemperature, and oil viscosity.

If readings are outside the normaloperating range, the low oilpressure message may display onthe Driver Information Center (DIC),or for vehicles without a DIC the oilpressure light will come on. If the oil



pressure message or light comeson, check the oil level immediately.Do not operate the engine with theoil pressure warning light on or anENGINE OIL LOW ADD OILmessage displayed.

Malfunction IndicatorLamp (Check EngineLight)This light is part of the vehicle’semission control on-boarddiagnostic system. If this light is onwhile the engine is running, amalfunction has been detected andthe vehicle may require service. Thelight should come on to show that itis working when the ignition is onwith the engine not running. See“Ignition Positions” in the owner’smanual.

This light may also come on whenthe system has detected a problemwith the Diesel Exhaust Fluid (DEF)management system. See DieselExhaust Fluid 0 27.

Malfunctions are often indicated bythe system before any problem isnoticeable. Being aware of the lightand seeking service promptly whenit comes on may prevent damage.

Caution

If the vehicle is driven continuallywith this light on, the emissioncontrol system may not work aswell, the fuel economy may belower, and the vehicle may notrun smoothly. This could lead tocostly repairs that might not becovered by the vehicle warranty.

Caution

Modifications to the engine,transmission, exhaust, intake,or fuel system, or the use ofreplacement tires that do notmeet the original tirespecifications, can cause this lightto come on. This could lead tocostly repairs not covered by thevehicle warranty. This could alsoaffect the vehicle’s ability to passan Emissions Inspection/Maintenance test. SeeAccessories and Modifications0 64.

When the light is on, a malfunctionhas been detected. Diagnosis andservice may be required.

Poor fuel quality can causeinefficient engine operation and poordriveability, which may go awayonce the engine is warmed up.If this occurs, change the fuel brand.It may require at least one full tankof the proper fuel to turn the light off.See Fuel for Diesel Engines 0 32.



If the light remains on, see yourdealer.

Emissions Inspection andMaintenance Programs

If the vehicle requires an EmissionsInspection/Maintenance test, thetest equipment will likely connect tothe vehicle's Data LinkConnector (DLC).

The DLC is under the instrumentpanel to the left of the steeringwheel. Connecting devices that arenot used to perform an EmissionsInspection/Maintenance test or toservice the vehicle may affectvehicle operation. See “Add-OnElectrical Equipment” in the owner’smanual. See your dealer ifassistance is needed.

The vehicle may not passinspection if:

. The light is on when the engineis running.

. The light does not come onwhen the ignition is on with theengine not running.

. Critical emission control systemshave not been completelydiagnosed. If this happens, thevehicle would not be ready forinspection and might requireseveral days of routine drivingbefore the system is ready forinspection. This can happen ifthe 12-volt battery has recentlybeen replaced or run down, or ifthe vehicle has recently beenserviced.

See your dealer if the vehicle willnot pass or cannot be made readyfor the test.

Wait-to-Start Light

This light comes on briefly whilestarting the engine, as a check toshow the light is working.

If the wait-to-start light comes on,the glow plug system is requiredand operating. Wait until the lightturns off before starting the engine.This light may not come on in warmtemperatures.

The fast warm-up glow plug systemmakes the wait-to-start light stay onfor a shorter amount of time thanmost diesel engines.

See Starting the Diesel Engine 0 16.



Diesel Exhaust Fluid(DEF) Warning Light

This light, a Driver InformationCenter (DIC) message, and a chimecome on when there is an issue withthe Diesel Exhaust Fluid.

If the DEF level has not beencorrected, the light will continue toflash when the vehicle is started.The vehicle's speed may also belimited.

Also see Diesel Exhaust Fluid 0 27.

Power Take-Off Light(Chassis Cab Only)

Chassis Cab

The vehicle may have a PowerTake-Off (PTO) light. Under normaloperating conditions, the PTO lightwill remain on throughout the PTOoperating cycle. If all conditionsrequired to engage PTO have notbeen met when enabling PTO, thePTO light will turn on, then turn offafter one second. See PowerTake-Off (PTO) 0 46.

Information Displays

Driver InformationCenter (DIC)The DIC is in the instrument cluster.The DIC comes on when the ignitionis on.

A Duramax diesel vehicle may havethe following additional DIC menuitems:

Exhaust Fluid Level : The DieselExhaust Fluid (DEF) level will bedisplayed as either OK, XX%,or LOW.

When LOW appears on the display,add DEF as soon as possible. SeeDiesel Exhaust Fluid 0 27.

Fuel Filter Life Remaining : Thisdisplay shows an estimate of thefuel filter's remaining useful life.If 90% Fuel Filter Life Remaining isdisplayed, it means 90% of thecurrent fuel filter life remains. Thefuel filter life system will alert whento change the fuel filter on aschedule consistent with yourdriving conditions.



When the remaining fuel filter life islow, the CHANGE FUEL FILTERmessage will appear on the display.Change the fuel filter as soon aspossible.

Fuel Filter Life Reset : Reset theFuel Filter Life Remaining displayafter each fuel filter change. It willnot reset itself. Also, be careful notto reset the display at any time otherthan when the fuel filter has justbeen changed because it cannot bereset accurately until the next fuelfilter change. The fuel filter life willchange to 100% when the systemhas been reset. To reset the system,press and hold the set/reset button,or the trip odometer reset stem ifthere are no DIC buttons, fortwo seconds while Fuel Filter LifeRemaining is displayed on the DIC.

Engine Hour (Hourmeter) : Showsthe total number of hours the enginehas run. The display also shows theengine idle hours.

VehiclePersonalization

Vehicle Personalization(Van Models)This vehicle may havecustomization capabilities that allowyou to program certain features toone preferred setting. Customizationfeatures can only be programmed toone setting on the vehicle andcannot be programmed to apreferred setting for two differentdrivers.

A Duramax diesel vehicle may havethe following additional vehiclepersonalization items:

Feature Settings Menu Items

The following are customizationfeatures that allow you to programsettings to the vehicle:

ELEVATED IDLE

This feature allows you to turn on oroff Elevated Idle.

Press U until ELEVATED IDLEappears on the DIC display.Press V once to access the settings

for this feature. Then press U toscroll through OFF, ON, or NOCHANGE. To select a setting, pressV while the desired setting isdisplayed on the DIC.

Vehicle Personalization(Pickup Models)Use the audio system controls toaccess the personalization menusfor customizing vehicle features.

The following features may beavailable on some vehicles with adiesel engine. See “VehiclePersonalization” in the owner’smanual for additional vehiclepersonalizations.

If equipped, these features may beselected using the infotainmentdisplay.



To access the vehiclepersonalization menu:

1. Touch the Settings icon on theHome Page of the infotainmentdisplay.

2. Touch Vehicle to display a listof available options.

3. Touch to select the desiredfeature setting.

4. Touch9 or R to turn a featureoff or on.

5. Touch z to go to the top levelof the Settings menu.

Climate and Air Quality

Select and the following maydisplay:

Rapid Heat-Elevated Idle

This allows the feature to be turnedon and off. See “Elevated Idle” inStarting the Diesel Engine 0 16.

Select Off or On.


16 Driving and Operating

Driving andOperating

Starting and OperatingStarting the Diesel Engine . . . . . 16Winter Cover . . . . . . . . . . . . . . . . . . . 19Engine Heater . . . . . . . . . . . . . . . . . 21Fuel Operated Heater (FOH)

(Van Models Only) . . . . . . . . . . . 23Parking over Things

That Burn . . . . . . . . . . . . . . . . . . . . 24

Diesel Particulate FilterDiesel Particulate Filter . . . . . . . . 24

Diesel Exhaust FluidDiesel Exhaust Fluid . . . . . . . . . . . 27

BrakesExhaust Brake . . . . . . . . . . . . . . . . . 30

FuelTop Tier Fuel . . . . . . . . . . . . . . . . . . 31Fuel Additives . . . . . . . . . . . . . . . . . 32Fuel for Diesel Engines . . . . . . . . 32Biodiesel . . . . . . . . . . . . . . . . . . . . . . . 33Cold Weather Operation . . . . . . . 34Water in Fuel . . . . . . . . . . . . . . . . . . 34Running Out of Fuel . . . . . . . . . . . 38

Fuel Filter Replacement . . . . . . . 38Filling the Tank . . . . . . . . . . . . . . . . 40Filling a Portable Fuel

Container . . . . . . . . . . . . . . . . . . . . . 41

Trailer TowingTrailer Towing . . . . . . . . . . . . . . . . . . 42

Conversions and Add-OnsPower Take-Off (PTO) . . . . . . . . . 46

Starting andOperating

Starting the DieselEngineThe diesel engine starts differentlythan a gasoline engine.

Caution

If the steering wheel is turneduntil it reaches the end of itstravel, and is held in that positionwhile starting the vehicle, damagemay occur to the hydraulic powersteering system and there may beloss of power steering assist.

Move the shift lever to P (Park) orN (Neutral). To restart the enginewhen the vehicle is already moving,use N (Neutral) only.


Driving and Operating 17

Caution

Do not try to shift to P (Park) if thevehicle is moving. If you do, youcould damage the transmission.Shift to P (Park) only when thevehicle is stopped.

Starting the Engine

1. Turn the ignition key toON/RUN.

Observe the wait-to-start light.See Wait-to-Start Light 0 12.This light may not come on ifthe engine is warm.

2. If the wait-to-start light is on,wait until this light goes off.Turn the ignition key to START,then release the ignition key.The engine will continue tocrank until the engine starts.

The engine has a fast warm-upglow plug system. Thewait-to-start light will illuminatefor a much shorter time than

most diesel engines, due to therapid heating of the glow plugsystem.

Caution

If the wait-to-start light stays onafter starting the vehicle, thevehicle may not run properly.Have the vehicle servicedright away.

3. If the engine does not startafter 15 seconds of cranking,turn the ignition off. Waitone minute for the crankingmotor to cool, then try thesame steps again.

If you are trying to start the engineafter you have run out of fuel, followthe steps in Running Out of Fuel0 38.

When the engine is cold, let it runfor a few minutes before driving.This lets oil pressure build up. Theengine will sound louder when itis cold.

For turbo protection, engine powerat speeds above idle may be limitedif the engine is cold. This protectioncan last up to a maximum of40 seconds at extreme cold coolantand ambient temperatures.

Cold Weather Starting

Use the recommended engine oilwhen the outside temperaturedrops below freezing. See EngineOil 0 69. When the outsidetemperature drops below –18 °C(0 °F), use of the engine coolantheater is recommended.

If you experience longer crankingtimes, notice an unusual amount ofexhaust smoke, or are at higherelevations (over 2 135 m or 7,000 ft),you may use the engine coolantheater. See Engine Heater 0 21.

See Fuel for Diesel Engines 0 32 forinformation on what fuel to use incold weather.

If the Diesel Engine Will NotStart

If the vehicle runs out of fuel, seeRunning Out of Fuel 0 38.



If the vehicle is not out of fuel, andthe engine will not start:

Turn the ignition key to ON/RUN.After the wait-to-start light goes off,turn the ignition key to START.

If the light does not go off, wait afew seconds, then try starting theengine again. See your dealer assoon as possible for a startingsystem check.

If the light comes on and then goesoff and you know the batteries arecharged, but the engine still will notstart, the vehicle needs service.

If the light does not come on whenthe engine is cold, the vehicleneeds service.

If the batteries do not have enoughcharge to start the engine, see“Battery” in the owner’s manual.

Check that the correct engine oilhas been used and changed atappropriate intervals. If the wrong oilis used, the engine may be harderto start.

Be sure you are using the properfuel for existing weather conditions.See Fuel for Diesel Engines 0 32.

If the engine starts, runs a shorttime, then stops, the vehicle needsservice.

{ Warning

Do not use gasoline or startingaids, such as ether, in the airintake. They could damage theengine, which may not becovered by the vehicle warranty.They could also cause a fire,which could cause seriouspersonal injury.

Engine Idle Variations

Under certain conditions the engineidle speed can vary or be elevated.Change in idle speed is normal anddoes not indicate a problem. Normalconditions that can raise idle speedare low voltage, DPF regeneration,air conditioning compressor loads,

and engine warmup. These speedscan range from approximately 600to 1000 rpm.

Elevated Idle

The engine has a cold temperaturehigh idle feature which elevates theengine idle speed from base idle to1050 to 1100 rpm for pickup modelsor 1200 rpm for van models whenoutside temperatures are below 0 °C(32 °F), and the engine coolanttemperature is below 65 °C (150 °F).This feature enhances heaterperformance by raising the enginecoolant temperature faster.

To turn this feature on oroff on pickup models,see Vehicle Personalization (VanModels) 0 14 orVehicle Personalization (PickupModels) 0 14.

On van models, this feature can beturned on and off using the DICbuttons.

When the engine is started, it willslowly ramp up to the high idlespeed after a delay of a fewseconds up to approximately



two minutes. For this method towork properly there must be nothrottle or brake pedal faults.

The engine idle speed will return tonormal once the following conditionsare met:

. Engine coolant temperaturereaches 65 °C (150 °F).

. Air intake temperature reaches0 °C (32 °F).

The high idle speed will betemporarily interrupted and theengine speed will return to normal ifany of the following conditionsoccur:

. The brake pedal is applied.

. The accelerator pedal ispressed.

. The transmission is shifted outof P (Park) or N (Neutral).

. Vehicle speed is detected.

Once these inputs are removed, theengine idle speed will slowly rampback up to high idle after the normal

delay, if the conditions for enginecoolant temperature and air intaketemperature are still met.

Fast Idle Control (Vans Only)

The vehicle may have this systemwhich can be used to increase theengine idle speed.

Fast Idle control will be enabledwhen the following conditionsare met:

. The parking brake is set.

. The transmission is in P (Park)or N (Neutral).

. The vehicle speed is about0 km/h (0 mph).

. The cruise control Set switch ispressed and released for PresetFast Idle Speed (1200 rpm).

Fast Idle control will be disabledwhen one or more of the followingconditions occur:

. The cruise control Set switch ispressed and released. See“Cruise Control” in the owner’smanual.

. The cruise control Cancel switchis pressed.

. The brake pedal is pressed.

. The transmission is shifted outof P (Park) or N (Neutral).

. The parking brake is released.

. The vehicle speed is not0 km/h (0 mph).

On vans, when fast idle is active, aFAST IDLE ON message will bedisplayed in the DIC.

Winter CoverPickups

Do not use a winter cover onpickups.

Vans

If equipped, the winter cover can beused to enhance heaterperformance in extremely coldconditions below −18 °C (0 °F). Thewinter cover installs over the grilleand restricts airflow to the enginecompartment.



For vehicles that did not come witha winter cover, a GM winter covercan be purchased. See your dealerfor additional information.

When the winter cover is in use, theheater, ventilation, and airconditioning AUTO mode may notfunction properly. Use the manualsettings for comfort.

Usage Guidelines

The winter cover should only beused while operating the vehicle inextremely cold temperatures or inheavy snow for extended periods. Inthese temperatures, the vehicledoes not need a large amount of airto properly cool the engine. Whenmore airflow is required to cool thevehicle, the winter cover should notbe used. The following usage

guidelines will allow adequateairflow for proper radiator and aircooler performance:

. Do not use the winter cover iftowing a trailer. The vehicle mayoverheat if the radiator iscovered while towing.

. Do not modify the cover. Thewinter cover does not coversome sections of the front of thevehicle to provide enoughairflow.

. When the winter cover is used,the outside air temperaturedisplay may not functionproperly.

. Keep the underside of the wintercover as clean as possible.Remove monthly or asnecessary and clean away dustand debris.

. Use only a mild soap to clean.Do not use harsh soap, strongdetergents, or vinyl protectant/sealant type products as theymay damage the special finish.Allow the winter cover to drycompletely before reinstalling.

Installation Instructions

When first trying to fit the cover, itmay appear to be undersized butwill stretch during installation toensure a tight fit. The initialinstallation of the cover is bestperformed when the winter coveris warm.

1. Open the hood and secure itwith the prop rod.



2. Hook the five J-clips to thebottom edge of the grille.

3. Hook the top center J-clip bythe hood latch.

4. Attach the metal hooks, oneeach at the top corners.

5. To remove the winter cover,reverse Steps 1–4.

Engine Heater

{ Warning

Do not plug in the engine blockheater while the vehicle is parkedin a garage or under a carport.Property damage or personalinjury may result. Always park thevehicle in a clear open area awayfrom buildings or structures.

If equipped, the engine heater canprovide easier starting in coldweather conditions at or below−18 °C (0 °F). The engine heatershould be plugged in at least fourhours before starting.

To Use the Engine Heater

1. Turn off the engine.



Pickups

Vans

2. Open the hood and unwrap theelectrical cord. The cord is inthe engine compartment, onthe driver side behind thebattery for pickups, and on thepassenger side for vans.

3. Clean and dry the heater cordand connector ends. Check theheater cord for damage. If it isdamaged, do not use it. Seeyour dealer for a replacement.Inspect the cord for damageyearly.

4. Plug it into a normal, grounded110-volt AC outlet.

{ Warning

Improper use of the heater cordor an extension cord can damagethe cord and may result inoverheating and fire.

. Plug the cord into athree-prong electrical utilityreceptacle that is protectedby a ground fault detection

(Continued)

Warning (Continued)

function. An ungroundedoutlet could cause anelectric shock.

. Use a weatherproof,heavy-duty, 15 amp-ratedextension cord if needed.Failure to use therecommended extensioncord in good operatingcondition, or using adamaged heater orextension cord, could makeit overheat and cause a fire,property damage, electricshock, and injury.

. Do not operate the vehiclewith the heater cordpermanently attached to the

(Continued)



Warning (Continued)

vehicle. Possible heatercord and thermostatdamage could occur.

. While in use, do not let theheater cord touch vehicleparts or sharp edges. Neverclose the hood on theheater cord.

. Before starting the vehicle,unplug the cord, reattachthe cover to the plug, andsecurely fasten the cord.Keep the cord away fromany moving parts.

5. Before starting the engine, besure to unplug and store thecord as it was before to keep itaway from moving engine partsand prevent damage.

The length of time the heater shouldremain plugged in depends on theoutside temperature. You may wishto use the coolant heater to improveease of starting at temperaturesbetween −18 °C (0 °F) and−29 °C (−20 °F). Keep the coolantheater plugged in for a minimum offour hours. At temperatures below−29 °C (−20 °F), the coolant heatershould remain plugged in for at leasteight hours. Be sure to store thecord before starting the engine. SeeFuel for Diesel Engines 0 32 forinformation on what fuel to use incold weather.

Caution

Do not use the engine heatercontinuously. This could damagethe engine heater and may causea fire. Always unplug the engineheater after use.

Fuel Operated Heater(FOH) (Van Models Only)

If equipped, the FOH will enhanceheater performance and will reducethe amount of time it takes to warmthe inside of the vehicle in coldconditions below or equal to 4 °C(39 °F).

The FOH is installed on the framerail on the driver side of the vehicleand uses diesel fuel to heat theengine coolant, which warms up thepassenger cabin air.



The FOH will turn on if all of thefollowing conditions exist:

. Outside air temperature is belowor equal to 4 °C (39 °F).

. Fuel level is greater or equal to12.5% of the total fuel tankvolume.

. The engine is running.

. Coolant temperature is less than70 °C (158 °F).

Parking over ThingsThat Burn

{ Warning

Things that can burn could touchhot exhaust parts under thevehicle and ignite. Do not parkover papers, leaves, dry grass,or other things that can burn.

Diesel ParticulateFilterThe vehicle has a Diesel ParticulateFilter (DPF) as part of the exhaustsystem to reduce vehicle emissions.The DPF requires a unique exhausttailpipe with an exhaust cooler. Theexhaust cooler mixes air with theexhaust to lower the temperaturebefore it leaves the tailpipe.

The DPF, the tailpipe, or otherexhaust system components mustnot be altered. Inspect regularly andclean any mud or dirt from theexhaust cooler, especially where theexhaust cooler connects to thetailpipe and the openings wherefresh air enters the cooler.

The DPF will clean itself as part ofnormal operation. Several factorsincluding fuel consumed, hours ofengine operation, and miles drivenare monitored by the Engine ControlModule (ECM). The self-cleaningoccurs approximately once per tankof fuel.

Caution

Damage can occur to the DPFcomponents if the required UltraLow Sulfur Diesel (15 ppm sulfurmaximum) fuel and either CJ-4 orCK-4 engine oil are not used.This damage would not becovered by the vehicle warranty.

Under certain driving conditions,such as stop-and-go traffic, the filtercannot clean itself. A messagecomes on when the DPF is dirty andneeds to perform a self cleaning.

For the filter to clean itself, thevehicle must be driven above50 km/h (30 mph) until the messagegoes off. This will take about30 minutes.

{ Warning

During DPF self-cleaning orduring extended idling in P (Park),the exhaust system and exhaust

(Continued)



Warning (Continued)

gases are very hot. Things thatburn could touch hot exhaustparts under the vehicle and ignite.You or others could be burned.Do not park, or idle for anextended period of time, near orover papers, leaves, dry grass,or other things that can burn.Keep the exhaust area clear ofmaterial that could ignite or burn.See Parking over Things ThatBurn 0 24.

Caution

Extended idle should be avoidedbecause the DPF system is notcapable of self cleaning at idle.During extended idle operation,monitor the instrument clustertelltale lights and DriverInformation Center for messagesand take appropriate indicated

(Continued)

Caution (Continued)

action. Continued idling with thewarning light/message on couldcause irreversible damage to theDPF requiring repair and possiblereplacement that might not becovered by the vehicle warranty.

You will also notice a change in theexhaust sound and engine idlespeed. Along with this, a burningsmell and reduction in fuel economymay be noticed. This is normal.

If you continue to drive with the DPFwarning message on and theexhaust filter is not cleaned asrequired, the malfunction indicatorlamp and the ENGINE POWER ISREDUCED message will come onand dealer service is necessary.See Malfunction Indicator Lamp(Check Engine Light) 0 11.

Vehicles with the DPF havespecific fuel and engine oilrequirements. See Fuel for DieselEngines 0 32 andEngine Oil 0 69.

Extended idling in P (Park) cancause exhaust parts and gases tobecome very hot. Keep the exhaustarea clear of material that couldignite or burn. See Parking overThings That Burn 0 24.

If equipped with PowerTake-Off (PTO), monitor theinstrument cluster for lights relatedto the DPF.

See Accessories and Modifications0 64 for important information if youare considering adding accessoriesor modifying the vehicle.

Manual Regeneration of DieselParticulate Filter

This feature is only available onFleet and Commercial vehicles.

To verify that the vehicle has thisfeature, refer to the Vehicle ServiceParts Identification label (SPID) forRPO code FPF or seewww.gmupfitter.com to contact theGM Upfitter Integration Group forassistance.



If equipped, this feature allows formanual cleaning/regeneration of theDPF when it is unable to cleanitself. It may be necessary toperform a manual regeneration ifdriving conditions — such asextended slow speed, stop-and-gotraffic, extended idles, short drivecycles, or stationary PTO operation— prevent DPF self-cleaning.

Manual regeneration can only beused when the DPF has become atleast 90% full. At 100% full, it willattempt to automatically self-clean ifproper driving conditions are met.The DPF will clean itself if thevehicle can be driven above50 km/h (30 mph) for about30 minutes.

A Driver Information Center (DIC)message displays when manualregeneration is possible.

Scroll through the DIC pages to findthe Exhaust Cleaning menu.Depending on whether the vehiclehas a base or uplevel cluster, it maybe under the Settings menu.

If the vehicle cannot be stoppedwhen the DIC message firstindicates cleaning is available,automatic self-cleaning may havebegun. If conditions cannot be metfor self-cleaning to complete, andmanual regeneration is selected, itmay take up to four minutes for thesystem to switch to manualregeneration. When the switchoccurs, a DIC message prompts tostart the cleaning process.

{ Warning

Do not leave the vehicle duringthe regeneration.

Make sure that there are noflammables near the muffler, DPFand exhaust pipe which mayresult in a fire.

Remember that the temperatureof exhaust gases is high enoughto burn you. You and others couldbe seriously injured.

Before starting the manualregeneration, make sure all of thefollowing safety conditions are met:

. The vehicle is parked on levelground, away from anyflammable materials.

. The vehicle is parked outdoors,away from any walls orbuildings.

. The vehicle is at least 3 m (10 ft)from any obstructions ormaterials that may combustor melt.

. The shift lever is in P (Park).

. The fuel tank is at leastone-eighth full.

. All fluids are at the proper level.

. No diagnostic trouble codeshave been set, and themalfunction indicator lamp isnot on.

. The engine coolant temperatureis above 71 °C (160 °F).

After making sure all of the safetyconditions have been met, press thetrip odometer reset stem or V on



the steering wheel control for atleast one second to select Start onthe infotainment display.

Follow the instructions in the DICmessages. Touch ACCEPT toacknowledge that all of these safetyconditions have been met and toactivate regeneration.

If the infotainment display returns tothe previous screen, then one ormore of the necessary operatingconditions has not been met. If youcannot determine which conditionhas not been met, seewww.gmupfitter.com to contact theGM Upfitter Integration Group forassistance.

Continue to follow the instructions inthe DIC messages. Hold theexhaust brake switch on the centerstack below the climate controls formore than three seconds, and thenrelease it, to begin the regenerationprocess.

If the EXHAUST BRAKE ONmessage displays, then the switchwas released too soon. Press it

again to turn off the exhaust brake,then try again when the DICmessage prompts.

When manual regeneration begins,the engine speed increases, theengine cooling fan sound increases,and a DIC message indicates thatcleaning is in progress.

A DIC message will display whencleaning has completed. Themessage will remain as long ascleaning is not necessary. Cleaningcould take up to 30 minutes. Uponcompletion, the engine will return tonormal idle, but exhaustcomponents will remain hot forseveral minutes. Do not move thevehicle until the exhaust has hadtime to cool. Manual regenerationcan be canceled at any time bypressing the brake pedal or turningthe engine off. Unusual noises maybe heard if regeneration isinterrupted.

Diesel Exhaust Fluid

{ Warning

Avoid getting Diesel ExhaustFluid (DEF) on your skin or inyour eyes as it could causeirritation. For more safety,handling, and storage information,see the Diesel Exhaust Fluidcontainer label.

Caution

Use only DEF that is GMapproved, or fluid containing theAPI certified or ISO 22241 label.The use of other fluids coulddamage the system, requiringcostly repairs that will not becovered by the vehicle warranty.



Caution

Do not mix fuel with DEF, and donot put DEF in the fuel tank. Thiscould lead to costly repairs thatmight not be covered by thevehicle warranty.

Diesel Exhaust Fluid (DEF) is usedwith diesel engines to reduce theamount of regulated emissionsproduced. Products such as AdBlueare types of DEF, and are approvedfor use in the vehicle as long asthey have an API certification labelor meet ISO 22241. The fluid levelin the DEF tank must be maintainedfor the vehicle to run properly. DEFis not a fuel additive. DEF shouldnot be mixed with or added to dieselfuel. DEF freezes when exposed totemperatures below −11 °C (12 °F).For DEF tank capacity seeCapacities and Specifications 0 97.

It is normal to hear the DEF systempurge fluid back into the tank afterthe vehicle is shut off.

Locating Diesel Exhaust Fluid

DEF can be purchased at yourdealer. Additionally, some dieseltruck fueling stations or retailersmay have DEF for purchase. Forvehicles with an active OnStar orconnected services plan, OnStarcan help to locate a DEF retailer.See “Customer Assistance Offices”in the owner’s manual for phonenumbers to assist in contacting aGM dealer. See RecommendedFluids and Lubricants 0 93.

Filling the DEF Tank

DEF Fill – Van Model Shown,4-Cylinder Pickups Similar

The blue DEF cap is behind thefuel/DEF door. Do not remove thefuel and DEF caps at the sametime. Fill diesel fuel and DEFindependently. Turn the DEF capcounterclockwise to remove.

In cold conditions DEF can freeze inthe DEF fill pipe opening. If thisprevents the filling of the DEF tank,place the vehicle in a warm garageovernight.



Fill the DEF tank on level groundand with the vehicle off. Whenadding DEF, it is recommended tofully fill the DEF tank. For DEF tankcapacity see Capacities andSpecifications 0 97. When addingDEF to an empty or very low tank,always add at least 7.5L (2 gal) offluid to release the vehicle fromspeed limitation.

When fluid reaches the top of theDEF fill pipe, stop filling. Do not topoff the DEF tank. If using a bottle orjug to refill DEF, follow theinstructions on the container labeland use a dedicated fill aid.

Caution

Do not overfill the DEF tank anddo not allow DEF to contact thefinished surfaces of the vehicle,as it could damage the vehiclefinish. If DEF is spilled duringfilling, wipe any affected surfacewith a damp cloth.

Make sure the cap is fully installed.

Push the fuel/DEF door closed.

DEF Low

As the DEF level drops, warningswill automatically be displayed in theDriver Information Center (DIC).Select Vehicle Information in theDIC to view DEF level status. SeeDriver Information Center (DIC)0 13.

Refill the DEF tank at the firstopportunity after a low warningindication to avoid vehicle speedlimitations.

It may take some time for thevehicle to detect that DEF has beenadded. If there was a vehicle speedlimitation, it will be removedgradually and it may take severalkilometers/miles for the DICmessage to update.

If DEF is added under freezingconditions, especially if DEF level islow and frozen, up to several hoursof drive time may be required toremove the speed limitation. It isrecommended to ensure the DEFtank level is 30% or higher duringwinter time.

The DEF range DIC message firstdisplays at approximately 1 600 km(1,000 mi). This message appearsagain at approximately 500 km(300 mi) of remaining range beforethe exhaust fluid tank becomesempty.

As the fluid level nears empty, thesemessages appear every time thevehicle is started.

If the DEF low warnings are ignoredand the DEF tank becomes empty,the DIC will display messages thatdescribe the action needed anddistance until vehicle speed islimited. For the DEF warning lightsymbol, see Diesel Exhaust Fluid(DEF) Warning Light 0 13.

DEF Quality Poor

Use only DEF that is GM approved,or fluid containing the API certifiedor ISO 22241 label.

DEF has an expiration date. If thesystem detects poor quality,or contaminated or diluted DEF, theDIC message will display along withdistance until vehicle speed islimited.



The speed limitation will occur in aseries of steps with the final speedlimitation being 8 km/h (5 mph)along with a flashing warning lightand chimes.

Adding fresh DEF to the systemmay resolve the problem afterseveral kilometers/miles of driving,depending on several factors. If theDIC message persists, see yourdealer or additional DIC messagesmay display.

Service DEF System

If a problem occurs with the DEFsystem, a DIC message displaysalong with distance until vehiclespeed is limited.

The speed limitation will occur in aseries of steps with the final speedlimitation being 8 km/h (5 mph)along with a flashing warning lightand chimes.

In some cases, this message willclear itself, indicating that the DEFsystem was able to correct thecondition. If the DIC message

persists, see your dealer oradditional DIC messages maydisplay.

Service Emission System

If a problem occurs with the vehicleemission system, a DIC messagedisplays along with distance untilvehicle speed is limited. The speedlimitation will occur in a series ofsteps with the final speed limitationof 88 km/h (55 mph) and chimes. Insome cases, this message will clearitself, indicating that the emissionsystem was able to correct thecondition. If the DIC messagepersists, see your dealer oradditional DIC messages maydisplay.

Brakes

Exhaust BrakeThe exhaust brake can be used toenhance the vehicle brake systemand reduce brake lining wear.

Downshifts may be automaticallyselected to increase engine speed,which increases the effectiveness ofthe exhaust brake. The number ofdownshifts selected is determinedby the length of time the brakes areapplied and the rate the vehicle isslowing. The system delivers thecorrect amount of braking to assistin vehicle control. The heavier thevehicle load, the more active theengine exhaust brake will be. Use ofthe exhaust brake will help maintainvehicle speed when used withcruise control. See “Cruise Control”in the owner’s manual.

Automatic downshifts will not occurif the vehicle is in Range SelectionMode. See “Manual Mode” in theowner’s manual.



The exhaust brake only activateswhen the transmission torqueconverter is locked. This can varybased on vehicle speed, gear,and load.

To activate the system, press theswitch on the center stack.

Pickups

Vans

The exhaust brake is activatedwhen Tow/Haul Mode is activated.See “Tow/Haul Mode” in the owner’smanual.

A light comes on in the instrumentcluster when the exhaust brake andTow/Haul are activated. The switchmust be pressed at each vehiclestart for the system to be active.

Fuel

Top Tier FuelGM recommends the use ofTOP TIER Diesel Fuel to keep theengine clean, reduce enginedeposits, and maintain optimalvehicle performance. Look for theTOP TIER Logo or seewww.toptiergas.com for a list ofTOP TIER Diesel Fuel marketersand applicable countries.



Fuel AdditivesTOP TIER Detergent Diesel ishighly recommended for use withyour vehicle. If your area does nothave TOP TIER Detergent Diesel,GM recommends the use ofACDelco Diesel Fuel Conditioner.This will help maintain optimalengine performance. GM does notrecommend other aftermarket dieseladditives.

If low-quality diesel is used forrefueling, GM recommends addingACDelco Fuel System TreatmentPlus-Diesel to help clean enginedeposits. This is available only atyour GM dealer.

Fuel for Diesel EnginesThe selection of a high-quality fuelis important for maintaining optimumvehicle performance. Diesel fuelshould meet or exceed the minimumrequirements in the most currentversions of the local fuel standards.

Do not use fuel with more than 15ppm sulfur.

Do not use a diesel blend containingmore than 20% biodiesel by volume.

Caution

Use of fuel that does not complywith the required technicalstandards can lead to enginepower loss, increased wear,or engine damage and may voidyour warranty.

Some improper fuels are:

. Diesel fuel with the additionof gasoline.

. Diesel fuel mixed withengine oil or automatictransmission fluid.

. Triglyceride fuels, such asraw vegetable oil or animalfat, in any form, includingwith blends of diesel orbiodiesel.

. Marine diesel fuel andfuel oils.

(Continued)

Caution (Continued)

. Diesel-water emulsions,such as Aquazole.

. Aftermarket diesel fueladditives, which containalcohols, organo-metallicadditives, or wateremulsifiers.

Caution

If the vehicle is accidentallyrefueled with gasoline, do notcontinue driving the vehicle.Driving the vehicle will damagethe fuel system. Have the vehicletowed to a qualified technician tohave the gasoline removed fromthe tank and fuel system. Refuelwith Ultra Low Sulfur Diesel fuel.It is also recommended to havethe fuel system flushed with UltraLow Sulfur Diesel, to ensure allgasoline is removed.



Some conditions, such as dirty fuel,may decrease fuel filter life and aCHANGE FUEL FILTER messagemay come on in the DriverInformation Center (DIC).

Climate Grade Diesel Fuels

At temperatures below 0 °C (32 °F),avoid using biodiesel blends above5% by volume. Using such a fuelmay cause fuel filter plugging,system gelling, and freezing, whichmay adversely impact vehiclestarting.

Severe winter grade diesel fuel,such as 1-D diesel fuel or Arcticgrade diesel fuel, can be used inextreme cold temperatures (below−18 °C or 0 °F); however, doing sowill reduce power and fuel economy.Avoid using severe winter grade fuelin warm or hot climates. It can resultin stalling, poor starting, anddamage to the fuel injection system.

Fuels improperly blended for coldtemperature operation may result inrestricted fuel filters. The vehicle isequipped with a fuel heating systemto prevent gelling or waxing of

conventional diesel fuel andbiodiesel blends, but may notprevent all cases.

In case of severe winter conditions,the fuel filter may become cloggedby wax naturally present in the fuel.To unclog it, move the vehicle to awarm garage area and allow thefilter to warm up. The fuel filter mayneed to be replaced. See Fuel FilterReplacement 0 38.

BiodieselBiodiesel is a renewable fuelproduced from vegetable oils oranimal fats that have beenchemically modified to make itcompatible with diesel fuel.

Caution

Do not use home-made biodieselor home test kits because thequality cannot be verified byapproved scientific methods. Donot use raw vegetable oil or otherunmodified bio-oils, fats,

(Continued)

Caution (Continued)

or blends of vegetable oil withdiesel. They could damage thefuel system and engine, anddamages would not be coveredby the vehicle warranty.

Biodiesel Blends

Fuels with a biodiesel content up to20% by volume may be used (e.g.,named B20). Only use biodieselblends up to 20% by volume thatcomply with your country’s orregion’s fuel standards.

Caution

Do not use blends containingmore than 20% biodiesel. Anyengine, fuel system, or exhaustafter-treatment system damagewould not be covered by thevehicle warranty.



As a renewable fuel, biodieselprovides some environmentalbenefits. However, biodiesel hasunique properties and needs to behandled differently than diesel fuel.Its use presents additional risks andmay not be appropriate in allsituations. Certain vehicle operatingmodes increase these risks andshould be avoided.

Biodiesel fuel quality degrades withtime and exposure to hightemperature quicker than Ultra LowSulfur Diesel fuel. More frequentrefueling provides the bestopportunity to have a supply of freshfuel. Storage at hot ambienttemperatures will acceleratebiodiesel degradation.

If the vehicle is not driven often anduses little fuel, or if it is stored forextended periods of time, avoid theuse of biodiesel blended fuelsabove 5% by volume. When thevehicle is stored for longer than onemonth, it should be run out ofbiodiesel to below one-quarter tank,

refueled with biodiesel-free fuel, anddriven several kilometers (miles)before storage.

Cold Weather OperationIn cold weather, the fuel filter maybecome clogged by wax naturallypresent in the fuel. To unclog it,move the vehicle to a warm garagearea and allow the filter to warm up.The fuel filter may need to bereplaced. See Fuel FilterReplacement 0 38.

At temperatures below 0 °C (32 °F),it is recommended to avoid usingbiodiesel blends above 5% blend.This blend may cause fuel filterplugging, system gelling, andfreezing that may affect vehiclestarting. You may need to turn theignition on and off a few timesbefore the vehicle will start. Also,idle the vehicle for a couple ofminutes before accelerating.

It is recommended to use Ultra LowSulfur No. 1-D diesel fuel or a blendof No. 1-D and No. 2-D diesel fuel toenhance vehicle operation in cold

weather at temperatures below 0 °C(32 °F). Use of No. 1-D diesel fuelmay lower the fuel economy. Foradditional information for better coldweather operation, see EngineHeater 0 21.

Water in FuelImproper fuel tank inspection orcleaning, or contaminated fuel fromsuppliers, can cause water to bepumped into the fuel tank along withthe diesel fuel. If a WATER IN FUELSERVICE REQUIRED messagedisplays, the water must be drainedimmediately.

{ Warning

Diesel fuel containing water is stillcombustible. You or others couldbe burned. If the fuel needs to bedrained, keep sparks, flames, andsmoking materials away from themixture.



Caution

Water in the diesel fuel cancorrode internal components ofthe fuel system and lead tosevere damage. It can alsosupport fungus or bacteriagrowth, which can damage thefuel system and Fuel OperatedHeater (FOH) (if equipped). Evenwith a diesel fuel biocide, the fuelsystem may still need to becleaned. Your dealer can adviseof the appropriate solution.

If the fuel tank needs to bepurged to remove water, see yourdealer or a qualified technician.Improper purging can damage thefuel system and block the FOH.

Water in Fuel Troubleshooting

If the WATER IN FUEL SERVICEREQUIRED message comes on:

ProblemRecommended

Action

Messagedisplays butgoes off duringthe ignitioncycle.

The fuel filter ispartially filledwith water. Drainthe water assoon aspossible. See"RemovingWater from theFuel Filter"following.

ProblemRecommended

Action

Messagedisplays andstays on.

Drain the fuelfilterimmediately.If no water canbe drained, andthe temperatureis belowfreezing, thenwater may befrozen in thefilter. Move thevehicle to awarm location tothaw the water,then drain thefuel. If water stilldoes not drain,see your dealer.



ProblemRecommended

Action

Immediatelyafter refueling,messagedisplays andstays on.

A large amountof water is in thefuel tank. Drainthe fuel filterimmediately.If the messagestays on orcomes back onwithoutrefueling, thenfuel tank purgingis required. Seeyour dealer.If the messagedisplays and theengine stalls orruns rough, donot drive untilthe watercontaminatedfuel is drained.

Caution

Driving with this message on candamage the fuel injection systemand the engine. If the messagecomes on right after a refuel,water was pumped into the fueltank. Turn off the engine anddrain the water immediately.

Removing Water from the FuelFilter

To drain water:

1. Turn the engine off and applythe parking brake.

Van

Pickup



2. Place a container under thefilter drain valve. The filter drainvalve is on the bottom of thefuel filter. The filter drain valveis under the vehicle on thedriver side, inside theframe rail.

3. For van models, open the drainvalve by turning itcounterclockwise. Allow thefilter to drain until all of thewater has been removed.Close the valve.

For pickup models, open thefuel filter cap by turning it twoto three turns. Allow the filter todrain until all of the water hasbeen removed. Close the caphand tight.

4. Properly dispose of the watercontaminated fuel.

5. Start the engine and let it runfor a few minutes. During thedraining process, air may haveentered the fuel system. If theengine stalls, the fuel systemmay need to be primed. See“Fuel Priming” following.

Fuel Priming

For the fuel system to work properly,the fuel lines must be full of fuel.If air gets in, the fuel lines need tobe primed before operating thevehicle and the Fuel OperatedHeater (FOH).

If air is present, the following mayhave happened:

. The vehicle ran out of fuel.

. The fuel filter was removed.

. The fuel lines were removed ordisconnected.

. The fuel filter water drain valvewas opened while the enginewas running.

. The FOH pump and FOH fuellines were removed ordisconnected.

The system is not harmed by air inthe fuel lines; however, the engineand/or the FOH may not start untilthe fuel system is primed and the airis removed.

Priming the Fuel System

There is an electric priming pumpthat will bring fuel to the engine andeliminate air in the fuel lines. Toprime the engine:

1. Correct any condition thatcaused the loss of prime.

2. Turn the ignition on for30 seconds. Do not start theengine. The fuel pump will startpriming.

3. Turn the ignition off, then backto start, and crank the enginefor 15 seconds.

4. If the engine does not start,repeat Steps 2 and 3 until theengine starts.

If the engine does not startafter repeating Steps 2 and 3three times, turn the ignitionkey off for 60 seconds.

5. Repeat the above steps untilthe engine starts.

6. If the engine starts, but doesnot run smoothly, increase theengine speed slightly.



7. If the engine starts and runsbut stalls again, turn theignition off for 60 seconds.

8. When the engine starts, let itidle for a few minutes andcheck the filter for any leaks.

To Prime the Fuel Operated Heater(FOH) Fuel Lines (Van Models)

See your dealer or qualifiedtechnician if the FOH fuel lines needto be primed.

Running Out of FuelIf the engine has stalled due torunning out of fuel, try to restart it:

1. If parked on a level surface,add at least 3.8 L (1 gal) of fuel.Up to 18.9 L (5 gal) may beneeded if parked on a slope.

2. Follow the vehicle fuel systempriming procedure earlier inthis section to re-prime thesystem and restart the engine.

If the check engine light comes ondue to running out of fuel, it maytake a few drive cycles to clear.

On van models only, the FuelOperated Heater (FOH) stopsautomatically when the fuel tankvolume is less than or equal to 10%of the total tank. The FOH fuel lineswill not need to be primed if thevehicle runs out of fuel.

Fuel Filter ReplacementVan Models

{ Warning

Diesel fuel is flammable. It couldstart a fire if something ignites it,and people could be burned. Donot let it get on hot engine parts,and keep matches or otherignition sources away.

The fuel filter is on the driver side,inside the frame rail.

To replace the fuel filter:

1. Drain any water from the filter.See “Removing Water from theFuel Filter” in Water in Fuel0 34.

Keep the engine off until theprocedure is completed.

2. Apply the parking brake.

3. Remove the filter element capby turning it counterclockwise.

4. Remove the filter element.If there is any dirt on the filtersealing surface, clean it off.

5. Install the new filter elementand o-ring.

6. Reinstall and tighten the filtercap to the housing.



7. Use the fuel filter primingprocedure to prime the fuelfilter. See “Fuel Priming” inWater in Fuel 0 34.

8. Start the engine and let it idlefor five minutes. Check the fuelfilter and air bleed valve forleaks.

9. Reset the fuel filter monitor.See Driver Information Center(DIC) 0 13.

If the van Fuel Operated Heater(FOH) (if equipped) is not working,the FOH line requires priming. Seeyour dealer for service. See FuelOperated Heater (FOH) (VanModels Only) 0 23.

Pickup Models

{ Warning

Diesel fuel is flammable. It couldstart a fire if something ignites it,and people could be burned. Donot let it get on hot engine parts,and keep matches or otherignition sources away.

The fuel filter is on the driver side,inside the frame rail in front of thefuel tank.

1. Drain any water from the filter.See “Removing Water from theFuel Filter” in Water in Fuel0 34.

Keep the engine off until theprocedure is completed.

2. Apply the parking brake.

3. There are two caps under thefilter. Clean the fuel filter areabefore removing these twofilter caps.

Caution

Failure to cover the fuel filter witha clean cloth to keep out debriswhen replacing may cause dirt toget into the engine. This couldcause engine damage. Keep thefuel filter covered with a cleancloth when replacing.

4. Remove both filter elements.If there is any dirt on the filtersealing surface, clean it off.

5. Install the new filter elementsand tighten both caps.



6. Use the fuel filter primingprocedure earlier in this sectionto prime the fuel filter.

7. Start the engine and let it idlefor five minutes. Check the fuelfilter for leaks.

8. Reset the fuel filter monitor.See Driver Information Center(DIC) 0 13.

Filling the TankAn arrow on the fuel gaugeindicates which side of the vehiclethe fuel door is on. See Fuel Gauge0 9. Do not refill the diesel fuel andDiesel Exhaust Fluid (DEF) at thesame time.

{ Warning

Fuel vapors and fuel fires burnviolently and can cause injury ordeath.

Follow these guidelines to helpavoid injuries to you and others:

(Continued)

Warning (Continued)

. Read and follow all theinstructions on the fuelpump island.

. Turn off the engine whenrefueling.

. Keep sparks, flames, andsmoking materials awayfrom fuel.

. Do not leave the fuel pumpunattended.

. Avoid using electronicdevices while refueling.

. Do not re-enter the vehiclewhile pumping fuel.

. Keep children away fromthe fuel pump and never letchildren pump fuel.

. Before touching the fillnozzle, touch a metallicobject to discharge staticelectricity from your body.

(Continued)

Warning (Continued)

. Fuel can spray out if the fuelcap is opened too quickly.This spray can happen if thetank is nearly full, and ismore likely in hot weather.Open the fuel cap slowlyand wait for any hiss noiseto stop, then unscrew thecap all the way.

Van Shown, Pickup Similar

The green fuel cap is behind ahinged door on the driver side of thevehicle. The blue Diesel Exhaust



Fluid cap is also behind the fueldoor. Do not remove both caps atthe same time.

Turn the fuel cap counterclockwiseto remove. When refueling, hang thefuel cap from the hook on the fueldoor. Fully insert and latch the fillnozzle, begin fueling.

{ Warning

Overfilling the fuel tank by morethan three clicks of a standard fillnozzle may cause:

. Vehicle performance issues,including engine stalling anddamage to the fuel system.

. Fuel spills.

. Under certain conditions,fuel fires.

Diesel fuel can foam when filling thetank. The automatic pump nozzlemay shut off, even if the tank is notfull. Wait for the foaming to stop,and then fill the tank more slowly.Be careful not to spill fuel. Waitfive seconds after pumping before

removing the fill nozzle. Clean fuelfrom painted surfaces as soon aspossible. See Exterior Care 0 87.

Reinstall the cap by turning itclockwise until it clicks. Push thefuel door closed.

{ Warning

If a fire starts while you arerefueling, do not remove the fillnozzle. Shut off the flow of fuel byshutting off the pump or bynotifying the station attendant.Leave the area immediately.

Caution

If a new fuel cap is needed, besure to get the right type of capfrom your dealer. The wrong typeof fuel cap may not fit properlyand could damage the fuelsystem.

Accidental Refueling withGasoline

Caution

If the vehicle is accidentallyrefueled with gasoline, do notcontinue driving the vehicleexcept to get to a location whereit can be stopped safely. Drivingthe vehicle will damage theengine. Tow the vehicle forservice. Have the gasolineremoved from the tank and fuelsystem.

Filling a Portable FuelContainer

{ Warning

Filling a portable fuel containerwhile it is in the vehicle can causefuel vapors that can ignite eitherby static electricity or other

(Continued)



Warning (Continued)

means. You or others could bebadly burned and the vehiclecould be damaged. Always:

. Use approved fuelcontainers.

. Remove the container fromthe vehicle, trunk, or pickupbed before filling.

. Place the container on theground.

. Place the nozzle inside thefill opening of the containerbefore dispensing fuel, andkeep it in contact with the fillopening until filling iscomplete.

. Fill the container no morethan 95% full to allow forexpansion.

. Do not smoke, lightmatches, or use lighterswhile pumping fuel.

. Do not use electronicdevices while pumping fuel.

Trailer TowingWhen towing at high elevation onsteep uphill grades, consider thefollowing:

Engine coolant at higher elevationwill boil at a lower temperature thanat or near sea level. If the engine isturned off immediately after towingat high elevation on steep uphillgrades, the vehicle may show signssimilar to engine overheating. Toavoid this, let the engine run whileparked (preferably on level ground)with the transmission in P (Park)and the parking brake applied for atleast five minutes before turning theengine off. If the overheat warningcomes on, see Engine Overheating0 77.

Use the following chart to determinethe maximum the trailer can weigh,based upon your vehicle model andoptions.

All axles of the trailer must beequipped with brakes adequate forthe intended use. Trailer brakingequipment conforming to CanadianStandards Association (CSA)requirement CAN3-D313, or itsequivalent, is recommended.



Colorado/Canyon Pickup Models – SAE J2807 Compliant

Vehicle Axle Ratio Max. Trailer Wt. GCWR *

Colorado/Canyon Pickup Models – 2WD

All 3.42 3 492 kg (7,700 lb) 5 761 kg (12,700 lb)

Colorado/Canyon Pickup Models – 4WD

Short Wheelbase Ext. Cab 3.42 3 492 kg (7,700 lb) 5 761 kg (12,700 lb)

Short Wheelbase Crew Cab 3.42 3 447 kg (7,600 lb) 5 761 kg (12,700 lb)

Colorado Pickup – LongWheelbase Crew Cab

3.42 3 447 kg (7,600 lb) 5 761 kg (12,700 lb)

Canyon Pickup – LongWheelbase Crew Cab

3.42 3 425 kg (7,550 lb) 5 761 kg (12,700 lb)

Colorado ZR2 Models – 4WD

All 3.42 2 268 kg (5,000 lb) 4 853 kg (10,700 lb)

*The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle andtrailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not beexceeded.



2500/3500 Series Van Models

Vehicle Axle Ratio Max. Trailer Wt.1 GCWR *

G2500 Cargo Van ShortWheelbase

3.42 3 175 kg (7,000 lb) 5 897 kg (13,000 lb)

G2500 Cargo Van LongWheelbase

3.42 2 767 kg (6,100 lb) 5 897 kg (13,000 lb)

G3500 Cargo Van ShortWheelbase

3.42 2 812 kg (6,200 lb) 5 897 kg (13,000 lb)

G3500 Cargo Van LongWheelbase

3.42 2 722 kg (6,000 lb) 5 897 kg (13,000 lb)

G2500 Passenger Van ShortWheelbase

3.42 2 858 kg (6,300 lb) 5 897 kg (13,000 lb)

G3500 Passenger Van ShortWheelbase

3.42 2 586 kg (5,700 lb) 5 897 kg (13,000 lb)

G3500 Passenger Van LongWheelbase

3.42 2 404 kg (5,300 lb) 5 897 kg (13,000 lb)

*The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle andtrailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not beexceeded.1For Full Box Vans, choose an appropriate hitch and load the truck and trailer within the limits of GCWR, GVWR,and RGAWR.Van hitch requirements: Trailer tongue weight (10-15% of trailer weight) if under 181 kg (400 lb) use weight carryinghitch. Greater than 181 kg (400 lb) requires weight distribution hitch. Do not exceed 454 kg (1,000 lb).



See “Trailer Towing” in the owner’smanual for kingpin weight and trailertongue weight information.

Weight of the Trailer Tongue

The tongue weight load (1) of anytrailer is very important because it isalso part of the vehicle weight. TheGross Vehicle Weight (GVW)includes the curb weight of thevehicle, any cargo carried in it, andthe people who will be riding in thevehicle as well as trailer tongueweight. Vehicle options, equipment,passengers, and cargo in thevehicle reduce the amount oftongue weight the vehicle can carry,which will also reduce the trailerweight the vehicle can tow.

The trailer tongue weight (1) shouldbe 10-15% of the total loadedtrailer (2). For Vans: The trailertongue weight (1) can use a weightcarrying hitch for up to 181 kg(400 lb). Greater than 181 kg(400 lb), a weight distribution hitch isrequired with a maximum of 454 kg(1,000 lb)

Do not exceed the maximumallowable tongue weight for thevehicle. Choose the shortest hitchextension that will position the hitchball closest to the vehicle. This willhelp reduce the effect of trailertongue weight on the rear axle.

Trailer rating may be limited by thevehicle's ability to carry tongueweight. Tongue or kingpin weightcannot cause the vehicle to exceedthe GVWR (Gross Vehicle WeightRating) or the RGAWR (Rear GrossAxle Weight Rating). See “TotalWeight on the Vehicle's Tires” in theowner’s manual.

After loading the trailer, weigh thetrailer and then the tongue,separately, to see if the weights areproper. If they are not, adjustmentsmight be made by moving someitems around in the trailer.

If a cargo carrier is used in thetrailer hitch receiver, choose acarrier that positions the load asclose to the vehicle as possible.Make sure the total weight,including the carrier, is no more thanhalf of the maximum allowabletongue weight for the vehicle or227 kg (500 lb), whichever is less.



Conversions andAdd-Ons

Power Take-Off (PTO)If equipped, the Power Take-Off(PTO) is a GM Upfitter integratedsystem that is used to create anauxiliary power source for runningadd-on equipment, such as saltspreaders, snow plows, winches,and lift buckets. The PTO systemcontrols engine speed to valueshigher than normal base idle, PTOload relay engagement, and remotestarting and shutdown of the engine.

When installing PTO aftermarketequipment, the PTO wiring andoperation recommendationsprovided by the service manual andGM Upfitter documentation must bestrictly followed.

Refer to the bulletins in the GMUpfitter Integration websitewww.gmupfitter.com for the PowerTake-Off (PTO) operatingdescription and application guide.

{ Warning

Engine exhaust contains CarbonMonoxide (CO), which cannot beseen or smelled. Exposure to COcan cause unconsciousness oreven death. Never operate PTOin an enclosed area such as agarage or building that has nofresh air ventilation. See “EngineExhaust” in the owner’s manual.

Caution

If the key is in the ignition duringRemote PTO operation, thevehicle can be shifted out ofP (Park). Even though PTO willbe disengaged, depending onPTO Upfitter application, personalinjury or property damage mayresult from vehicle movement.Always remove the key from theignition before operatingRemote PTO.

Primary PTO Operating Modes

PTO modes of operation are:

. Preset

Stationary operation only: In-cabcontrol is standard, remotecontrol is available.

. Variable

Stationary operation only: In-cabcontrol is standard, remotecontrol is available.

. Mobile

In-cab control only.

. Operator Selectable In-CabMode (OSIM)

OSIM is for in-caboperation only.

OSIM is for vehicles that requireboth stationary and mobilemodes. OSIM is available via theGM Service Tool only. During theconfiguration of OSIM, twomodes must be paired. Theoptions for pairing are: stationarypreset and mobile, or stationaryvariable and mobile. Duringactivation of OSIM, the operator



must select one of the twomodes within the pre-configuredpairing. If an OSIM mode is notselected, PTO will not operate.

OSIM modes of operation are:

‐ Stationary

For stationary mode, theconfiguration may bestationary preset or stationaryvariable.

‐ Mobile

For mobile mode, theconfiguration is variable only.

Selection between OSIMpairings is not available.

Remote modes are notavailable.

The factory default programmingenables in-cab control. Forstationary modes, a GM ServiceTool can reprogram the system toallow for remote control and disablethe in-cab control.

All PTO modes provide for enginerpm control and PTO load relaycontrol.

All PTO modes provide for safetyinterlocks for PTO loaddisengagement.

Remote PTO modes provide forremote engine starting andshutdown.

Stationary in-cab and Remote PTOmodes provide for engine shutdowndue to critical engine conditions, aswell as a timed engine shutdownfeature.

Preset PTO

Preset Enable Conditions –In-Cab Operation

To enable PTO:

1. With the engine running, shiftthe vehicle into P (Park) andset the parking brake. Do notpress the brake pedal.

2. Confirm that cruise controlis off.

3. Press and release the PTOin-cab switch below the climatecontrols in the center stack.The PTO indicator light willblink rapidly until the PTO load

relay becomes engaged andwill then be on steady. Theengine will advance to the PTOStandby Speed.

4. Once the PTO Standby Speedis reached, use SET− and+RES on the cruise control toreach the Set 1 or Set 2 PTOengine speeds.

The accelerator pedal isdisabled and cannot be used tooverride the PTO presetspeeds.

Factory Default PTO EngineSpeeds

Standby 900 rpm

Set 1 (SET−) 1200 rpm

Set 2 (+RES) 1900 rpm

The first time a vehicle is usedfor PTO:

1. The PTO Control setting on theGM Service Tool isprogrammed to Interior ModePTO Switch.



2. Check the correct operation ofthe default PTO presetstationary mode to observe thethree idle up speeds. The PTOfunction should be confirmedbefore any wiring modificationsare done or anyreprogramming is attempted.See your dealer if the defaultpresets are not functioningproperly.

3. The PTO indicator light will notinitially reflect the status of thePTO load until the PTO loadrelay is wired into the system.The PTO load relay output isenabled as a factory default.When the PTO indicator light iseither blinking or on solid, thePTO relay output will beactivated.

Preset Enable Conditions –Remote Operation

This requires programming with theGM Service Tool and remote switchpanel provided by GM Upfitter.


2. Set the parking brake and shiftthe transmission into P (Park).

3. Turn the engine off. Remove orplace the key in the ignition offposition. Lock the vehicle,if desired.

4. Confirm the hood is closed.

5. From outside the vehicle, pressand release the Remote PTOArm switch.

6. Within five seconds, open andclose the Remote PTO EngineStart/Shutdown switch.

7. The horn will chirp, and thenengine starting will beautomatically initiated. ThePTO system will then elevateengine rpm to PTO StandbySpeed and engage the PTOload relay.

8. The Remote PTO Set switchcan now be used to accomplishthe PTO Set 1 and Set 2engine speeds.

The accelerator pedal isdisabled when Remote PTOoperation is selected.

Preset Enable Conditions –Remote Operation In-Cab Enable


Starting remote operation in-cab:

1. With the engine running, shiftthe vehicle into P (Park),release the brake pedal, andset the parking brake.



4. Press and release the in-cabPTO switch.

5. The horn will chirp, the PTOload relay will engage, and theengine will advance to the PTOStandby Speed.

6. The Remote PTO Set switchmay be used to select PTO Set1 and Set 2 engine speeds.

The accelerator pedal is disabledwhen Remote PTO operation isselected.

The operator may exit the vehicle.



{ Warning

If the key is in the ignition duringRemote PTO operation, thevehicle can be shifted out ofP (Park) by an unauthorizedoperator. Even though PTO willbe disengaged, depending onPTO Upfitter application, personalinjury or property damage mayresult from vehicle movement.The operator must ensure that thevehicle is secured againstunauthorized access duringRemote PTO operation.

Remote PTO operation may beended by pressing the brake pedalat which time the PTO load relaydisengages and the engine returnsto base idle speed. The operatormay drive the vehicle after releasingthe parking brake.

Preset Enable Conditions –Operator Selectable In-CabMode (OSIM)

This requires programming with theGM Service Tool and requirespairing OSIM stationary preset withOSIM mobile mode. If OSIM pairinghas been configured, initiate OSIMpreset operation:

1. With the engine running, shiftthe vehicle into P (Park) andrelease the brake pedal, andset the parking brake.

2. Confirm cruise control is off.


4. Press and release the in-cabPTO switch. The PTO indicatorlight will blink slowly.

5. Within 10 seconds, press andrelease SET− on the cruisecontrol.

6. The PTO indicator light willchange to solid when the PTOload relay becomes engaged.The engine speed will advanceto the PTO Standby Speed.Press and release SET− on the

cruise control to select the PTOSet 1 speed. Press and release+RES on the cruise control toselect the PTO Set 2 speed.

. The PTO load relay engagesimmediately when the PTOoperation is initiated by theswitch input. The transmissiontorque converter is unlocked.The torque converter will lockupon reaching stable PTOStandby Speed (default = 900rpm) so maximum power isavailable.

. The first elevated engine speed,PTO Standby Speed, is notintended as a working speed butas a verification that the systemis active and ready to go to aworking speed. This speed canbe modified to a working speedwith the GM Service Tool. Theupper limit for PTO StandbySpeed is 1500 rpm.

. The remote switches and relayconnections are made at thePTO Upfitter Connector locatedon the chassis frame behindthe cab.


50 Driving and Operating. The PTO Control setting on the

Service Tool must beprogrammed to Remote PTOMode Switch before the remoteswitches can be used.

. The PTO relay is programmed tobe enabled in the factory defaultconfiguration.

. Refer to the service manual orgo to the GM Upfitter Integrationwebsite www.gmupfitter.com fordetails, advanced programmingfeatures, and usage with aremovable pendant.

Variable PTO

Variable Enable Conditions –In-Cab Operation

To enable PTO:

1. With the engine running, shiftthe vehicle into P (Park) andset the parking brake. Do notpress the brake pedal.

2. Press and release the PTOin-cab switch below the climatecontrols in the center stack.The PTO indicator light willblink rapidly until the PTO load

relay becomes engaged andwill then be on steady. Theengine will advance to the PTOStandby Speed.

3. Once PTO Standby Speed isreached, SET− and +RES onthe cruise control can be usedto tap up and tap down theengine speed. Factory settingfor the tap step is 100 rpm andthe setting for the ramp rate is150 rpm/sec. The GM ServiceTool can enable the capabilityto change the default value fortap step via the RadioCustomization menu. Thedefault values for both tap stepand ramp rate can be changedwith the GM Service Tool. Theaccelerator pedal is disabled,and cannot be used to controlPTO engine speed.

Variable Enable Conditions –Remote Operation

This requires programming with theGM Service Tool and theappropriate remote switch panelprovided by GM Upfitter.


2. Set the parking brake and shiftthe transmission into P (Park).

3. Turn the engine off. Remove orplace the key in the ignition offposition. Lock the vehicle,if desired.

4. The hood must be closed.

5. From outside the vehicle, pressand release the Remote PTOArm switch.

6. Within five seconds, open andclose the Remote PTO EngineStart/Shutdown switch.

7. The horn will chirp, and thenengine starting will beautomatically initiated. ThePTO system will then elevateengine rpm to PTO StandbySpeed and engage the PTOload relay.



Variable Enable Conditions –Remote Operation In-Cab EnableStarting Remote Operation fromIn-Cab





4. Press and release the PTOin-cab switch.

5. The horn will chirp, the PTOload relay will engage, and theengine will advance to the PTOStandby Speed.

The operator may exit the vehicle.

{ Warning

If the key is in the ignition duringRemote PTO operation, thevehicle can be shifted out ofP (Park) by an unauthorizedoperator. Even though PTO willbe disengaged, depending onPTO Upfitter application, personalinjury or property damage mayresult from vehicle movement.The operator must ensure that thevehicle is secured againstunauthorized access duringRemote PTO operation.

The accelerator pedal is disabledwhen Remote PTO operation isselected.

Remote PTO operation can beended by pressing the brake pedal.The PTO load relay disengages andthe engine returns to base idlespeed. The operator may drive thevehicle after releasing the parkingbrake.

. The desired engine operatingspeed can now beaccomplished. Two versions ofengine rpm control are available,switches or potentiometer,depending on which one wasinstalled.

‐ Switches – the Remote PTOSet and Resume switches canbe used to tap up and tapdown to the desired enginespeed.

‐ Potentiometer – a RemotePTO Throttle Potentiometercan be used as a continuousvariable throttle control to dialin the desired engine speed.

Variable Enable Conditions– OSIM

This requires programming with theGM Service Tool and specificpairing of stationary variable andmobile modes. Remote operation isnot available.

If OSIM pairing has beenconfigured, initiate OSIM stationaryvariable operation:






4. Press and release the PTOin-cab switch. The PTOindicator light will blink slowly.

5. Within 10 seconds, press andrelease SET− on the cruisecontrol. The PTO load relay willengage and the PTO indicatorlight will change to solid. Theengine speed will advance tothe PTO Standby Speed.

6. The desired operating speedmay be achieved by tappingup and down with +RES andSET− on the cruise control.

. The PTO load relay engagesimmediately when the PTOoperation is initiated by theswitch input. The transmissiontorque converter is unlocked.The torque converter will lockupon reaching stable PTO

Standby Speed (default = 900rpm) so maximum power isavailable.

. The first elevated engine speed,PTO Standby Speed, is notintended as a working speed butas a verification that the systemis active and ready to go to aworking speed.

. The relay connections are madeat the PTO Upfitter Connectorlocated on the chassis framebehind the cab.

. The engine speeds can beadjusted between the low ofPTO Standby Speed and thehigh of PTO Max Engine speedlimits. Both values can bemodified from the factory defaultsettings with the GM ServiceTool. Based on the value chosenfor PTO Max Engine Speed, thePTO menu in the center stackmay show speeds that are notavailable.

. Factory setting for the tap step is100 rpm and the setting for ramprate is 150 rpm/sec. The default

value for tap step can bemodified via the RadioCustomization menu. Thedefault values for both tap stepand ramp rate can be changedwith the GM Service Tool.

. The PTO load relay is enabledas the factory defaultprogrammed setting.

. Refer to the service manual orgo to the GM Upfitter Integrationwebsite www.gmupfitter.com fordetails.

Mobile PTO

Mobile Enable Conditions –In-Cab Operation Only

This requires programming with theGM Service Tool.

1. The engine must be running.

2. The parking brake must bereleased.


4. Engine rpm must be less than1500 rpm.



5. Shift the transmission to M1,M2, or M3.

6. Tap the brake pedal and thendo not press the brake pedal.

7. Keep the driver door closed.The driver door can be keptopen if reconfigured using theGM Service Tool. Seewww.gmupfitter.com.

8. Press and release the PTOin-cab switch below the climatecontrols in the center stack.Then within 10 seconds pressand release +RES on thecruise control. The PTOindicator light will blink slowlybetween presses. The PTOindicator light will then blinkrapidly until the PTO loadbecomes engaged, and thencome on steady. The enginespeed will remain at the currentthrottle setting or advance toPTO Standby Speed,whichever value is greater.If the engine rpm is above1500 rpm, the PTO relay willnot engage until the enginerpm drops below 1500 rpm.

9. Once engaged, if additionalengine speed is desired, useeither the cruise control or theaccelerator pedal to temporarilyadjust the engine speed.

‐ +RES on the cruise controlcan be used to tap up, or ifcontinuously held to rampup, to the desired operatingspeed. SET− on the cruisecontrol can be used to tapdown or coast down ifcontinuously held to thedesired engine speed. Toplimit is PTO Max EngineSpeed, default 2100 rpm andprogrammable to 2900 rpm.Lower limit is PTO StandbySpeed, default 900 rpm withprogram range from baseidle to 900 rpm.

‐ The accelerator pedal can beused to achieve the desiredspeed. When the desiredspeed is reached, SET− onthe cruise control would beused to capture and maintain

that speed. Normal tap upand tap down can then beused to fine tune the setting.

In Mobile PTO mode, the vehiclespeed achieved is the result of thecurrent engine speed requested andthe transmission gear rangeselected. When the vehicle isplaced in M2 or M3, the vehicle willupshift according to engine rpm setpoint, and vehicle speed willincrease. To prevent upshifts andmaintain lower vehicle speeds,place the vehicle in M1.

Mobile Enable Conditions –Operator Selectable In-CabMode (OSIM)

This requires programming with theGM Service Tool and specificpairing mobile mode with eitherstationary preset or variable.Remote operation is not available.

See “Mobile PTO” previously in thissection.



PTO System DisengageConditions

Preset or Variable StationaryModes – In-Cab Operation

To disengage PTO, do one of thefollowing:

. Press the brake pedal. Theengine returns to base idle, butthe PTO load relay remainsengaged. The PTO indicatorlight will blink slowly indicatingthat a PTO set speed is stillstored in memory. Uponreleasing the brake, the factorydefault programming is for theengine speed to remain at curbidle. A press and release of+RES on the cruise control willrestore engine rpm to the lastPTO set speed. The PTOsystem can also be programmedto return engine rpm to the PTOStandby Speed setting.

. Press* on the cruise control.The engine returns to base idle,but the PTO load relay remainsengaged. The PTO indicatorlight will blink slowly indicating

that a PTO set speed is stillstored in memory. Activating+RES on the cruise control willrestore engine rpm to the lastPTO set speed.

. Press and release the PTOin-cab switch. The PTO loadrelay disengages and the enginereturns to base idle. The PTOindicator light will turn off,indicating the PTO load relay isdisengaged and the stored setspeed has been cleared frommemory.

Stationary Modes (Preset orVariable) – Remote Control

To disengage PTO:

. Open the Remote PTO EngineStart/Shutdown switch. Loadrelay disengages and the enginewill stop.

. If equipped, press the PTOEmergency Stop switch. Loadrelay disengages and the enginewill stop. Refer to the bulletins inthe GM Upfitter Integrationwebsite www.gmupfitter.com for

the Power Take-Off (PTO)operating description andapplication guide.

. With the key in the ignition androtated to the RUN position,press the brake pedal. The PTOload relay disengages and theengine returns to base idlespeed. The operator may drivethe vehicle.

Stationary Modes will alsodisengage if:

. Vehicle movement is detected.

. The parking brake is released.

. The transmission is shifted outof P (Park).

. The ignition is cycled from RUNto OFF.

. The PTO feedback signal is lostindicating the load is disengagedif used. Seewww.gmupfitter.com.

. Cruise control becomes enabled.

. Timed auto-engine shutdown:This feature will shut down theengine automatically after a



predefined time. PTO must beoperational for this function to beactive.

. Engine shutdown based oncritical engine or PTO systemfault conditions: This feature willshut down the engine when PTOis operating if a critical enginecondition such as low oil, low oilpressure, hot engine, hottransmission, low fuel, or DieselParticulate Filter regeneration isdetected by the vehicle system.If PTO operation is continuedwhen critical engine conditionsare present, a horn chirpwarning will occur after 30–60 seconds. The engine will shutdown two minutes after the hornwarning. The engine can berestarted with the ignition key orwith the Remote PTO enginestart controls. The horn warningand engine shutdown will againoccur if the critical enginecondition is still present.

Resume memory speed is clearedfor the above actions.

When Remote PTO engine startinghas been initialized with the ignitionkey in the RUN position, the shiftlever will remain locked if the brakepedal is pressed and a shift fromP (Park) is attempted while theengine is running and PTO is active(standby mode). A shift out ofP (Park) will not be allowed until oneof the following actions is taken bythe vehicle operator:

. Press the Remote PTO EngineStart/Shutdown switch.

. Press the PTO in-cab switch(only if the PTO in-cab RemoteStart/Stop feature is enabled).This requires programming withthe GM Service Tool.

. Press5 on the cruise control.

. Release the parking brake.

Mobile Mode

To disengage PTO:

. Press the brake pedal. The PTOsystem releases control ofengine speed, but the PTO loadrelay remains engaged. Theengine will return to base idle

unless the accelerator pedal ispressed. The PTO load relayremains engaged. The PTOindicator light will blink slowlyindicating that a PTO set speedis still stored in memory. Uponreleasing the brake, the factorydefault programming is for theengine speed to remain at curbidle awaiting an input from +RESon the cruise control to restoreengine rpm to the last PTO setspeed. The system can also beprogrammed to return enginerpm to the PTO Standby Speedsetting.

. Press* on the cruise control.The engine returns to base idle,but the PTO load relay remainsengaged. The PTO indicatorlight will blink slowly indicatingthat a PTO set speed is stillstored in memory. Pressing+RES on the cruise control willrestore engine rpm to the lastPTO set speed.

. Press the PTO in-cab switch.Load relay disengages and theengine returns to base idle. The



PTO indicator light will turn off,indicating the PTO load relay isdisengaged and the stored setspeed has been cleared frommemory.

Mobile Mode will also disengage if:

. PTO feedback input is lost. Theengine speed is returned to thePTO Standby speed setting andthe load is still engaged. This isconfigurable with the GMService Tool.

. Vehicle Speed exceeds MaxVehicle Speed. Factory defaultsetting = 94 km/h (58 mph). PTOrelay will re-engage andadvance to the last enginespeed stored in memory whenboth the Vehicle Speed isreduced below 94 km/h (58 mph)and the engine speed rampsdown below the maximum PTOengagement speed (1500 rpmfactory default setting).

. Engine Speed exceeds MaxEngine Speed for more than15 seconds. Factory defaultsetting = 2100 rpm.

. 5 on the cruise control ispressed.

. The parking brake is applied.

. The shift lever is moved out ofmanual shift selection, M1,M2, or M3.

Resume memory speed is clearedfor the above actions.

Although the PTO system attemptsto limit accelerator and PTO switchinputs to comply with maximumspeed and/or rpm parameters, somevehicle operating conditions such asdownhill acceleration can cause thevehicle speed or engine rpm toexceed these limits. In those cases,the PTO system may disengage.

Operator Selectable In-CabMode (OSIM)

To disable OSIM Stationary PTO:

. Press and release the PTOin-cab switch.

To disable OSIM Mobile PTO:

. Press and release the PTOin-cab switch.

Prolonged or Extended PTOOperation

When operating the vehicle instationary PTO mode, the DieselParticulate Filter (DPF) will continueto filter the exhaust and accumulatesoot. The engine control system,depending on the speed and loadbeing applied by the PTO, may notbe able to generate enough energyor adequate heat needed toautomatically clean or regeneratethe DPF. If manual regeneration isnot initiated, continued operationunder conditions that do not alloweffective regeneration or cleaningwill eventually plug the DPF andresult in reduced power. TheENGINE POWER IS REDUCEDDriver Information Center (DIC)message and malfunction indicatorlamp will be displayed, and dealerservice will be required to return thevehicle to normal, full poweroperation. To prevent this fromoccurring, frequently monitor thevehicle during stationary PTOoperation, paying particular attentionto any horn chirps and/or the



CLEAN EXHAUST FILTER SEEOWNER MANUAL NOW DICwarning messages. If the DICmessage is displayed during PTOoperation, see Diesel ParticulateFilter 0 24 for information on how toclean or regenerate the DPF.

PTO Operational SpeedControl

Variable PTO operational speedcontrol provides the followingfunctions:

Cruise Control SET− (In-Cab) orRemote PTO Set 1 Switch

SET : Press and hold theaccelerator to obtain the desiredengine speed, then press andrelease SET− on the cruise control.The current engine speed will bemaintained. This action can berepeated as desired to capture ahigher rpm value. The PTO setspeed cannot exceed 2900 rpm.

TAP DOWN : Press and releaseSET− on the cruise control toreduce the engine speed byincrements of 100 rpm. The tapdown engine speed increments can

be adjusted by the GM Service Tool.The Service Tool can enable theoption for adjustment of tap downengine speed increments throughthe Radio Customization menu.

COAST : Press and hold SET− onthe cruise control to reduce the rpmat 150 rpm/sec until the desiredengine speed is reached or until theinitial PTO Standby Speed isreached.

In-Cab Cruise Control +RES orRemote PTO Set 2 Switch

RESUME : After a PTO set speedhas been met, a Resume Speedmessage is retained after anapplication of the brake pedal.Engine speed will reduce to basicidle speed. The PTO indicator lightwill blink slowly indicating theprevious PTO set speed has beenretained in memory. Press andrelease +RES on the cruise controlto resume the previous PTO setspeed.

TAP UP : Press and release +RESon the cruise control to increase theengine speed by increments of 100rpm (factory preset value). The tapup engine speed increments can beadjusted by the GM Service Tool.The Service Tool can enable theoption for adjustment of tap upengine speed increments throughthe Radio Customization menu.

ACCEL : Press and hold +RES onthe cruise control to increase therpm by 150 rpm/sec until thedesired engine speed is reached oruntil the maximum allowable PTOset speed is reached. Alternatively,the engine speed acceleration canbe adjusted through the RadioCustomization menu.



Factory Preset ParametersThe following table lists the factory preset parameters. These may be altered by the GM Service Tool to configure thevarious PTO features.

ProgrammableParameters

Factory Setting Minimum Value Maximum Value

PTO Option Configuration VEHICLE STATIONARY,PRESET SPEED

VEHICLE STATIONARY,PRESET SPEED

VEHICLE STATIONARY,VARIABLE SPEEDVEHICLE MOBILE,VARIABLE SPEED

PTO Control In-Cab PTO Mode In-Cab PTO Mode, RemotePTO Mode, Operator

In-Cab SelectableMode (OSIM)

Type of Set SwitchOperation

MOMENTARY MOMENTARY LATCHING

PTO SET 1 Engine SpeedAfter PTO On

DISABLED DISABLED ENABLED

PTO Load Feedback DISABLED DISABLED ENABLED

PTO Relay ENABLED DISABLED ENABLED

Keep PTO Relay Engagedduring Braking or upon

Pressing *

ENABLED DISABLED ENABLED





Action after Brake IsReleased

RETURN TO BASEIDLE rpm

RETURN TO BASEIDLE rpm

RETURN TOSTANDBY rpm

Max. vehicle speed may belimited to 64 km/h (40 mph)if this is programmed with

the GM Service Tool.

Set Low Fuel Level forEngine Shutdown

15% 0% 25%

Engine Run Time with PTOActive Timer


Engine Run Time whilePTO Is Active

420 min 10 min 3480 min

PTO Max. Engine Speed 2100 rpm 1100 rpm 2900 rpm

Min. Engine Speed forPTO Engagement

500 rpm 500 rpm 1000 rpm

Max. Engine Speed forPTO Engagement

1500 rpm 1000 rpm 1800 rpm

PTO Standby rpm 900 rpm 700 rpm 1500 rpm

PTO Set Speed 1 1200 rpm 1100 rpm 2900 rpm

PTO Set Speed 2 1900 rpm 1900 rpm 2900 rpm





Engine Speed Tap Step 100 rpm 4 rpm 500 rpm

Engine Speed Ramp Rate 150 rpm 4 rpm 150 rpm

Maximum Vehicle Speed 94 km/h (58 mph) 30 km/h (19 mph) 94 km/h (58 mph)

Minimum RemotePotentiometer Threshold

2% 0% 50%

Maximum RemotePotentiometer Threshold

95% 50% 100%

Remote Set SwitchTransition to Low Voltage(<33% of Ignition Voltage)

SET SPEED 1 STANDBY SPEED, SET SPEED 1, or SET SPEED 2

Remote Set SwitchTransition to Open State(>33% of Ignition, and

<67% of Ignition Voltage)

PTO STANDBY STANDBY SPEED, SET SPEED 1, or SET SPEED 2

Remote Set SwitchTransition to High Voltage(>67% of Ignition Voltage)

SET SPEED 2 STANDBY SPEED, SET SPEED 1, or SET SPEED 2

Horn Chirps during aRemote Start Event


Personalization Menu ENABLED DISABLED ENABLED





Standby Speed Menu DISABLED DISABLED ENABLED

Set 1 Speed Menu(In Stationary Preset)


Set 2 Speed Menu(In Stationary Preset)


Engine Run ShutdownTime Menu

(In Stationary Preset)


Engine Speed TapStep Menu

(In Stationary Variable andMobile)


Remote Set Switch SpeedControl


Remote Throttle SpeedControl


Remote Engine Start DISABLED DISABLED ENABLED

Remote Engine Shutdown DISABLED DISABLED ENABLED

Throttle Override ENABLED DISABLED ENABLED

Throttle Override Timer 10 Minutes 10 Minutes 13 Minutes





Driver Door Status Usage ENABLED DISABLED ENABLED

Remote PTO In CabControl


If the PTO factory presetparameters do not match thesettings described above, then theymay have already been altered inorder to satisfy the requirements ofthe installed PTO system and bodyequipment.

The following PTO settings are alsooffered via the vehicle customizationscreens, which can be enabled byyour service technician. Theseinclude the following parameters:

. PTO Standby rpm

. PTO Set 1 Speed

. PTO Set 2 Speed

. Tap Step Speed

. PTO Engine Run Timer

Driver Information Center (DIC)Warning Messages

If the PTO indicator light does notremain on, it indicates that not allPTO enabling conditions have beenmet. One or more of the followingDIC messages may display if thePTO will not engage and theappropriate action must be taken.

. PTO: SHIFT TO PARK (P)(Stationary mode only)

. PTO: SET PARK BRAKE(Stationary mode only)

. PTO: PRESS & RELEASEBRAKE (Mobile mode only)

. PTO: RELEASE BRAKE TOENGAGE PTO

. PTO: REDUCE VEHICLESPEED

. PTO: REDUCE ENGINE SPEED

. PTO: DISENGAGE CRUISECONTROL

. PTO: ACCELERATION UPONBRAKE RELEASE

. PTO: SERVICE PTO

. PTO: SHIFT TO M1, M2 OR M3(Mobile mode only)

. Action Required CleaningExhaust Filter Continue Driving(DPF only)

. Action Required CleaningExhaust Filter Must ContinueDriving (DPF only)


Driving and Operating 63. Exhaust Filter Cleaning

Available Go to Options Menu(DPF only)

In addition, the PTO indicator lightwill light when all conditionsrequired to engage PTO have notbeen met. When enabling PTO, thePTO indicator light will turn on, thenturn off after one second. Undernormal operating conditions, thePTO indicator light will remain onthroughout the PTO operating cycle.

Additional in-vehicle PTO moduleinformation can be accessed by theservice technician to aid introubleshooting. Also see theservice manual for moreinformation.

The GM service technician canaccess Service Tool information thatwill contain reasons why PTO maynot engage and why PTO mayunexpectedly disengage due tosystem conditions.

See www.gmupfitter.com forinformation on the installation ofwiring and programming for PTOaftermarket equipment.

Diesel Particulate FilterCleaning during PTOOperation

This feature is only available onFleet and Commercial vehicles. Toverify that the vehicle has thisfeature, see www.gmupfitter.com tocontact the GM Upfitter IntegrationGroup for assistance.

If equipped, this feature allows formanual cleaning/regeneration of theDiesel Particulate Filter (DPF) whenit is unable to clean itself. It may benecessary to perform a manualregeneration if driving conditions —such as extended slow speed,stop-and-go traffic, extended idles,short drive cycles, or stationary PTOoperation — prevent DPFself-cleaning.

Manual regeneration can only beused when the DPF has become atleast 90% full. At 100% full, it willattempt to automatically self-clean ifproper driving conditions are met.The DPF will clean itself if the

vehicle can be driven above50 km/h (30 mph) for about30 minutes.

Manual regeneration can be usedduring a stationary PTO session.However it is strongly recommendedthat the exhaust filter be cleanedbefore continuous PTO. If manualregeneration is operatingconcurrently with PTO then the PTOsystem will retain control of theengine speed. Low PTO enginespeeds will cause regeneration totake longer. To initiate a manualDPF regeneration, see “ManualRegeneration of Diesel ParticulateFilter” in Diesel Particulate Filter0 24.


64 Vehicle Care

Vehicle Care

General InformationAccessories andModifications . . . . . . . . . . . . . . . . . 64

Vehicle ChecksEngine CompartmentOverview . . . . . . . . . . . . . . . . . . . . . 66

Engine Oil . . . . . . . . . . . . . . . . . . . . . 69Engine Oil Life System . . . . . . . . 72Automatic TransmissionFluid . . . . . . . . . . . . . . . . . . . . . . . . . 72

Engine Air Cleaner/Filter . . . . . . . 72Cooling System . . . . . . . . . . . . . . . . 74Engine Overheating . . . . . . . . . . . . 77Battery (4-CylinderPickup Only) . . . . . . . . . . . . . . . . . 78

Electrical SystemEngine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . 79

Appearance CareExterior Care . . . . . . . . . . . . . . . . . . 87

General Information

Accessories andModificationsAdding non-dealer accessories ormaking modifications to the vehiclecan affect vehicle performance andsafety, including such things asairbags, braking, stability, ride andhandling, emissions systems,aerodynamics, durability, andelectronic systems like antilockbrakes, traction control, and stabilitycontrol. These accessories ormodifications could even causemalfunction or damage not coveredby the vehicle warranty.

Damage to vehicle componentsresulting from modifications or theinstallation or use of non-GMcertified parts, including controlmodule or software modifications, isnot covered under the terms of thevehicle warranty and may affectremaining warranty coverage foraffected parts.

GM Accessories are designed tocomplement and function with othersystems on the vehicle. See yourdealer to accessorize the vehicleusing genuine GM Accessoriesinstalled by a dealer technician.

See the warranty manual.


Vehicle Care 65

Aftermarket EnginePerformance EnhancementProducts and Modifications

Some aftermarket engineperformance products andmodifications promise a way toincrease the horsepower and torquelevels of the vehicle's powertrain.You should be aware that theseproducts could have harmful effectson the performance and life of theengine, exhaust emission system,transmission, and drivetrain. Theengine, transmission, and drivetrainhave been designed and built tooffer industry leading durability andperformance in the most demandingapplications. Engine powerenhancement products may enable

the engine to operate at horsepowerand torque levels that coulddamage, create failure, or reducethe life of the engine, engineemission system, transmission, anddrivetrain. Damage, failure,or reduced life of the engine,transmission, emission system,drivetrain, or other vehiclecomponents caused by aftermarketengine performance enhancementproducts or modifications might notbe covered under the vehiclewarranty.


66 Vehicle Care

Vehicle Checks

Engine Compartment Overview

2.8L 4-Cylinder Engine Pickup Models


Vehicle Care 67

1. Coolant Surge Tank andPressure Cap

2. Engine Air Cleaner/Filter

3. Engine Oil Fill Cap

4. Engine Fan (Out of View)

5. Engine Oil Dipstick

6. Engine Compartment FuseBlock

7. Brake Fluid Reservoir

8. Windshield Washer FluidReservoir

9. Battery


68 Vehicle Care

2.8L 4-Cylinder Engine Van Models


Vehicle Care 69

1. Battery

2. Coolant Surge Tank andPressure Cap

3. Engine Fan (Out of View)

4. Engine Oil Fill Cap

5. Engine Oil Dipstick

6. Engine Air Cleaner/Filter

7. Engine Compartment Fuse Box

8. Power Steering Fluid Reservoir

9. Brake Fluid Reservoir

10. Windshield Washer FluidReservoir

Engine OilTo ensure proper engineperformance and long life, carefulattention must be paid to engine oil.Following these simple, butimportant steps will help protectyour investment:

. Use engine oil approved to theproper specification and of theproper viscosity grade. See“Selecting the Right Engine Oil”in this section.

. Check the engine oil levelregularly and maintain theproper oil level. See “CheckingEngine Oil” and “When to AddEngine Oil” in this section.

. Change the engine oil at theappropriate time. See “EngineOil Life System” in the owner’smanual.

. Always dispose of engine oilproperly. See “What to Do withUsed Oil” in this section.

Checking Engine Oil

Check the engine oil level regularly,every 650 km (400 mi), especiallyprior to a long trip. The engine oildipstick handle is a loop. SeeEngine Compartment Overview 0 66for the location.

{ Warning

The engine oil dipstick handlemay be hot; it could burn you.Use a towel or glove to touch thedipstick handle.

If a low oil Driver Information Center(DIC) message displays, check theoil level.

Follow these guidelines:

. To get an accurate reading, parkthe vehicle on level ground.Check the engine oil level afterthe engine has been off for atleast two hours. Checking theengine oil level on steep gradesor too soon after engine shutoffcan result in incorrect readings.Accuracy improves whenchecking a cold engine prior tostarting. Remove the dipstickand check the level.

. If unable to wait two hours, theengine must be off for at least15 minutes if the engine iswarm, or at least 30 minutes ifthe engine is not warm. Pull outthe dipstick, wipe it with a cleanpaper towel or cloth, then push itback in all the way. Remove itagain, keeping the tip down, andcheck the level.


70 Vehicle Care

When to Add Engine Oil

If the oil is below the cross-hatchedarea at the tip of the dipstick andthe engine has been off for at least15 minutes, add 1 L (1 qt) of therecommended oil and then recheckthe level. See “Selecting the RightEngine Oil” later in this section foran explanation of what kind of oil touse. For engine oil crankcasecapacity, see Capacities andSpecifications 0 97.

Caution

Do not add too much oil. Oillevels above or below theacceptable operating rangeshown on the dipstick are harmfulto the engine. If the oil level is

(Continued)

Caution (Continued)

above the operating range (i.e.,the engine has so much oil thatthe oil level gets above thecross-hatched area that showsthe proper operating range), theengine could be damaged. Drainthe excess oil or limit driving ofthe vehicle, and seek a serviceprofessional to remove theexcess oil.

See Engine Compartment Overview0 66 for the location of the engineoil fill cap.

Be sure to add enough oil to put thelevel somewhere in the properoperating range. Push the dipstickall the way back in when through.

Selecting the Right Engine Oil

Selecting the right engine oildepends on both the proper oilspecification and viscosity grade.See Recommended Fluids andLubricants 0 93.

Specification

Ask for and use engine oils thatmeet the dexos2 specification.Engine oils that have beenapproved by GM as meeting thedexos2 specification are markedwith the dexos2 approved logo. Seewww.gmdexos.com.

Use of Substitute Engine Oils ifdexos2 is unavailable: In the eventthat dexos2-approved engine oil isnot available at an oil change or formaintaining proper oil level, youmay use substitute engine oil thatmeets ACEA C3 of the appropriateviscosity grade.


Vehicle Care 71

Caution

Failure to use the recommendedengine oil or equivalent can resultin engine damage not covered bythe vehicle warranty.

Viscosity Grade

Use SAE 5W-30 viscosity gradeengine oil.

Cold Temperature Operation: In anarea of extreme cold, where thetemperature falls below −29 °C(−20 °F), an SAE 0W-40 oil may beused. An oil of this viscosity grade

will provide easier cold starting forthe engine at extremely lowtemperatures. When selecting an oilof the appropriate viscosity grade, itis recommended to select an oil ofthe correct specification. See“Specification” earlier in this section.

Engine Oil Additives/EngineOil Flushes

Do not add anything to the oil. Therecommended oils meeting thedexos2 specification are all that isneeded for good performance andengine protection.

Engine oil system flushes are notrecommended and could causeengine damage not covered by thevehicle warranty.

What to Do with Used Oil

Used engine oil contains certainelements that can be unhealthy foryour skin and could even causecancer. Do not let used oil stay onyour skin for very long. Clean yourskin and nails with soap and water,or a good hand cleaner. Wash orproperly dispose of clothing or rags


72 Vehicle Care

containing used engine oil. See themanufacturer's warnings about theuse and disposal of oil products.

Used oil can be a threat to theenvironment. If you change yourown oil, be sure to drain all the oilfrom the filter before disposal. Neverdispose of oil by putting it in thetrash or pouring it on the ground,into sewers, or into streams orbodies of water. Recycle it by takingit to a place that collects used oil.

Engine Oil Life SystemThe engine oil life system calculatesengine oil life based on vehicle useand displays the CHANGE ENGINEOIL SOON message when it is timeto change the engine oil and filter.The oil life system should be resetto 100% only following an oilchange. See “Engine Oil LifeSystem” in the owner’s manual.

Automatic TransmissionFluid

When to Check and Change(2.8L 4-Cylinder Engine PickupModels)

See “Automatic Transmission Fluid”in the owner’s manual.

When to Check and Change(2.8L 4-Cylinder Engine VanModels)

It is not necessary to check thetransmission fluid level.A transmission fluid leak is the onlyreason for fluid loss. If a leakoccurs, take the vehicle to yourdealer and have it repaired as soonas possible.

There is a special procedure forchecking and changing thetransmission fluid. Because thisprocedure is difficult, this should bedone at your dealer. Contact yourdealer for additional information.

Change the fluid and filter at theintervals listed in MaintenanceSchedule 0 90, and be sure to usethe fluid listed in RecommendedFluids and Lubricants 0 93.

Engine Air Cleaner/Filter

2.8L 4-Cylinder Engine PickupModels

See “Engine Air Cleaner/Filter” inthe owner’s manual.

2.8L 4-Cylinder Engine VanModels

The air cleaner/filter assembly is onthe front of the engine compartmenton the driver side of the vehicle.See Engine Compartment Overview0 66.

When to Inspect the Engine AirCleaner/Filter

For intervals on changing andinspecting the engine air filter, seeMaintenance Schedule 0 90.


Vehicle Care 73

How to Inspect the Engine AirCleaner/Filter

Do not start the engine or have theengine running with the engine airfilter housing open. Before removingthe engine air filter, make sure thatthe engine air filter housing andnearby components are free of dirtand debris. Remove the engine airfilter. Lightly tap and shake theengine air filter (away from thevehicle) to release dust and dirt.Inspect the engine air filter fordamage, and replace if damaged.Do not clean the engine air filter orcomponents with water orcompressed air.

1. Screws2. Retaining Clips3. Housing Base4. Housing Cover5. Turbo Air Duct

To inspect and replace the filter:

1. Remove the two screws (1)and lift the air cleaner/filterhousing base (3) to clear theturbo air duct (5).

2. Unlock the two retainingclips (2) on the sides of thehousing cover (4) and on thehousing base and pull thecover off.

3. Remove the air cleaner/filterfrom the housing base. Takecare to dislodge as little dirt aspossible.

4. Clean the air cleaner/filtersealing surface andhousing base.

5. Install the engine air cleaner/filter by aligning the arrow onone side of the air cleaner/filterend cap with the arrow on topof the housing base.

6. Reinstall the housing cover byaligning the arrow on top of thecover to the arrow on top of thehousing base, and fasten thetwo retaining clips.

7. Align the two bushings underthe housing base to the guidepins below on the closureassembly and push thehousing base into place.

8. Reinstall the two screws tosecure the housing base.


74 Vehicle Care

See Maintenance Schedule 0 90 todetermine when to replace theengine air cleaner/filter.

{ Warning

Operating the engine with the aircleaner/filter off can cause you orothers to be burned. Use cautionwhen working on the engine. Donot start the engine or drive thevehicle with the air cleaner/filteroff, as flames may be present ifthe engine backfires.

Caution

If the air cleaner/filter is off, dirtcan easily get into the engine,which could damage it. Alwayshave the air cleaner/filter in placewhen driving.

Cooling SystemThe cooling system allows theengine to maintain the correctworking temperature.

2.8L 4-Cylinder Engine PickupModels

See “Cooling System” in theowner’s manual.

2.8L 4-Cylinder Engine VanModels

1. Coolant Surge Tank2. Coolant Surge Tank

Pressure Cap

3. Engine Cooling Fan (Outof View)

{ Warning

An underhood electric fan canstart up even when the engine isnot running and can cause injury.Keep hands, clothing, and toolsaway from any underhoodelectric fan.

{ Warning

Do not touch heater or radiatorhoses, or other engine parts.They can be very hot and canburn you. Do not run the engine ifthere is a leak; all coolant couldleak out. That could cause anengine fire and can burn you. Fixany leak before driving thevehicle.


Vehicle Care 75

Engine Coolant

The cooling system in the vehicle isfilled with DEX-COOL enginecoolant mixture. See RecommendedFluids and Lubricants 0 93 andMaintenance Schedule 0 90.

The following explains the coolingsystem and how to add coolantwhen it is low. If there is a problemwith engine overheating, see EngineOverheating 0 77.

A 50/50 mixture of clean, drinkablewater and DEX-COOL coolant will:

. Give freezing protection down to−37 °C (−34 °F).

. Give boiling protection up to129 °C (265 °F).

. Protect against rust andcorrosion.

. Help keep the proper enginetemperature.

. Let the warning lights andgauges work as they should.

What to Use

{ Warning

Plain water, or other liquids suchas alcohol, can boil before theproper coolant mixture will. Withplain water or the wrong mixture,the engine could get too hot butthere would not be an overheatwarning. The engine could catchfire and you or others could beburned.

Use a 50/50 mixture of clean,drinkable water and DEX-COOLcoolant which will not damagealuminum parts. If using thismixture, nothing else needs to beadded.

If coolant has to be added morethan four times a year, have yourdealer check the vehicle coolingsystem.

Caution

Do not use anything other than amix of DEX-COOL coolant thatmeets GM StandardGMW3420 and clean, drinkablewater. Anything else can causedamage to the engine coolingsystem and the vehicle, whichwould not be covered by thevehicle warranty.

Never dispose of engine coolant byputting it in the trash, or by pouringit on the ground or into sewers,streams, or bodies of water. Havethe coolant changed by anauthorized service center, familiarwith legal requirements regardingused coolant disposal. This will helpprotect the environment and yourhealth.

Checking Coolant (2.8L 4-CylinderEngine Pickup Models)

See “Engine Coolant” in the owner’smanual.


76 Vehicle Care

Checking Coolant (2.8L 4-CylinderEngine Van Models)

The coolant surge tank is near thecenter of the engine compartment.See Engine Compartment Overview0 66 for location.

The vehicle must be on a levelsurface. When the engine is cold,the coolant level should be at theindicated mark.

Adding Coolant (2.8L 4-CylinderEngine Pickup Models)

See “Engine Coolant” in the owner’smanual.

Adding Coolant (2.8L 4-CylinderEngine Van Models)

Caution

If coolant is changed or added,always add enough to fill thesystem completely or enginedamage may occur.

If more coolant is needed, add theproper DEX-COOL coolant mixtureat the surge tank, but be careful notto spill it.

{ Warning

Spilling coolant on hot engineparts can burn you. Coolantcontains ethylene glycol and it willburn if the engine parts are hotenough.

{ Warning

Steam and scalding liquids from ahot cooling system are underpressure. Turning the pressurecap, even a little, can cause themto come out at high speed andyou could be burned. Never turnthe cap when the cooling system,including the pressure cap, is hot.Wait for the cooling system andpressure cap to cool.

If no coolant is visible in the surgetank, add coolant as follows:

2.8L 4-Cylinder Van Pressure Cap

1. Remove the coolant surge tankpressure cap when the coolingsystem, including the coolantsurge tank pressure cap andupper radiator hose, is nolonger hot.


Vehicle Care 77

Turn the pressure cap slowlycounterclockwise about one fullturn. If a hiss is heard, wait forthat to stop. A hiss meansthere is still some pressure left.

2. Keep turning the pressure capslowly, and remove it.

3. Slowly fill the coolant surgetank. Do not let the coolantlevel go above the indicatedmark in the tank until after theengine comes to operatingtemperature in Step 4.

4. With the coolant surge tankpressure cap off, start theengine and let it run until theengine coolant temperaturegauge indicates approximately90 °C (195 °F).

By this time, the coolant levelinside the coolant surge tankmay be lower. If the level islower, slowly add more of theproper mixture to the coolantsurge tank until it reaches theindicated mark.

5. Re-install the pressure cap.

Be sure the pressure cap ishand-tight and fully seated.

6. Verify coolant level after theengine is shut off and thecoolant is cold. If necessary,repeat Steps 1–6.

If the coolant level is still low afterhaving followed these steps twice,have the coolant system checked bya certified technician at the dealerfor a possible leak.

Caution

If the pressure cap is not tightlyinstalled, coolant loss and enginedamage may occur. Be sure thecap is properly and tightlysecured.

Engine OverheatingThere is an engine coolanttemperature gauge on theinstrument cluster. See the owner’smanual.

If Steam Is Coming from theEngine Compartment

{ Warning

Steam and scalding liquids from ahot cooling system are underpressure. Turning the pressurecap, even a little, can cause themto come out at high speed andyou could be burned. Never turnthe cap when the cooling system,including the pressure cap, is hot.Wait for the cooling system andpressure cap to cool.

Caution

Do not run the engine if there is aleak in the engine cooling system.This can cause a loss of allcoolant and can damage thesystem and vehicle. Have anyleaks fixed right away.


78 Vehicle Care

If No Steam Is Coming fromthe Engine Compartment

A Driver Information Center (DIC)message, along with a low coolantcondition, can indicate a seriousproblem.

If there is an engine overheatwarning and the vehicle does nothave a low coolant condition, andno steam is heard or seen, theproblem may not be too serious.Sometimes the engine can get alittle too hot when the vehicle:

. Climbs a long hill on a hot day.

. Stops after high-speed driving.

. Idles for long periods in traffic.

. Tows a trailer. See “Driving onGrades” under “DrivingCharacteristics and Towing Tips”in the owner’s manual.

If the DIC message comes on withno sign of steam, try this for aminute or so:

1. In heavy traffic, let the engineidle in N (Neutral) whilestopped. If it is safe to do so,

pull off the road, shift toP (Park) or N (Neutral), and letthe engine idle.

2. Turn on the heater to full hot atthe highest fan speed andopen the window as necessary.

If the vehicle no longer has theoverheat warning, the vehicle canbe driven. Just to be safe, driveslower for about 10 minutes. If thewarning does not come back on,drive normally and have the coolingsystem checked for proper fill andfunction.

If the warning continues, pull over,stop, and park the vehicleright away.

If there is still no sign of steam andthe vehicle is equipped with anengine driven cooling fan, pushdown the accelerator until theengine speed is about twice as fastas normal idle speed for at leastfive minutes while the vehicle isparked. If the warning is still there,turn off the engine and get everyoneout of the vehicle until it cools down.

Battery (4-CylinderPickup Only)Pickups with a 4-cylinder dieselengine are equipped with an AGM(Absorbing Glass Mat) 12-voltbattery. Installation of a standard12-volt battery will result in reducedcold cranking performance. Whenusing a battery charger on the AGMbattery, use the AGM setting on thecharger, if available, to limit chargevoltage to 14.8 volts. Follow thecharger manufacturer's instructions.See “Battery - North America” in theowner’s manual.


Vehicle Care 79

Electrical System

Engine CompartmentFuse BlockFor additional fuse and electricalinformation, see “Electrical System”in the owner’s manual.

The engine compartment fuse blockis in the engine compartment, onthe driver side of the vehicle. SeeEngine Compartment Overview 0 66

Lift the cover to access the fuseblock.

Caution

Spilling liquid on any electricalcomponent on the vehicle maydamage it. Always keep thecovers on any electricalcomponent.

A fuse puller is available inside thisfuse block.

{ Danger

Fuses and circuit breakers aremarked with their ampere rating.Do not exceed thespecified amperage rating whenreplacing fuses and circuitbreakers. Use of an oversizedfuse or circuit breaker can resultin a vehicle fire. You and otherscould be seriously injured orkilled.


80 Vehicle Care

4-Cylinder Pickup


Vehicle Care 81

The vehicle may not be equippedwith all of the fuses, relays, andfeatures shown.

Fuses Usage

F1 Traction controlmodule power

F2 Engine controlmodule power

F3 Air conditioningclutch

F4 NOx sensors/Exhaust particulatesensors

F5 Engine controlmodule/Integratedchassis controlmodule/Water infuel sensor

F6 Front wipers

F7 Cargo lamp/Bedlighting

F8 Engine controlmodulemiscellaneous

F9 Engine controlmodule

Fuses Usage

F10 Engine controlmodule-injectors

F11 Mass airflowsensor

F12 Starter

F13 Traction controlmodule

F14 –

F15 –

F16 –

F17 Front axle actuator

F18 –

F19 –

F20 Fuel pump

F21 Front blower

F22 Antilock brakesystem valves

F23 –

F24 Trailer

F25 Transfer caseelectronic control

Fuses Usage

F26 Antilock brakesystem pump

F27 Trailer brakecontrol module

F28 Rear windowdefogger

F29 –

F30 Driver heated seat

F31 –

F32 Passengerheated seat

F33 Body controlmodule 3

F34 Integrated chassiscontrol module

F35 –

F36 Centerhigh-mountedstoplamp

F37 Right high-beamheadlamp

F38 Left high-beamheadlamp


82 Vehicle Care

Fuses Usage

F39 Rear differentiallock actuators

F40 Front differentiallock actuators/Selective catalyticreduction powermodule wake up

F41 Glow plug module

F42 –

F43 –

F44 Fuel heater

F45 Selective catalyticreduction powermodule heater

F46 Cooling fan clutch

F47 Heater crankcaseventilation

F48 Fog lamps

F49 Selective catalyticreduction powermodule wake up

F50 Trailer parkinglamps

Fuses Usage

F51 Horn

F52 –

F53 –

F54 –

F55 –

F56 Washer pump

F57 –

F58 –

F59 –

F60 Mirror defogger

F61 –

F62 Selective catalyticreduction powermodule

F63 –

F64 Trailer reverselamps

F65 Left trailerstoplamp/Turnlamp

F66 Right trailerstoplamp/Turnlamp

Fuses Usage

F67 Electric powersteering

F68 –

F69 Battery regulatedvoltage control

F70 –

F71 –

F72 –

F73 –

F74 Generator

F75 –

Relays Usage

K1 Air conditioningclutch

K2 Starter

K3 Powertrain sensor

K4 Wiper speed

K5 Wiper control

K6 Cargo lamp/Bedlighting


Vehicle Care 83

Relays Usage

K7 Powertrain

K8 Fuel pump

K9 Front differentiallock actuators

K10 Rear differentiallock actuators

K11 Centerhigh-mountedstoplamp

K12 Fuel heater

Relays Usage

K13 Selective catalyticreduction powermodule heatercontrol/Dieselexhaust fluidcontrol

K14 Trailer parkinglamps

K15 Run/Crank

K16 Cooling fan clutch

K17 Rear windowdefogger/Mirrordefogger


84 Vehicle Care

4-Cylinder Van


Vehicle Care 85


Fuses Usage

1 Antilock brakesystem motor

2 Antilock brakesystem module

3 Right trailerstoplamp/Turnlamp

4 –

5 –

6 Fuel system controlmodule/Ignition

7 Body controlmodule 5



10 Instrument cluster

11 Trailer wiring

12 –

Fuses Usage

13 Display/Mirrors/Rear vision camera

14 Washer

16 Horn

17 Transmission

18 Air conditioning

19 Engine controlmodule battery

20 Left stop/turncutaway lamp

21 Left stop/turntrailer lamp

22 Right stop/turncutaway lamp

23 NOx sensors

24 Diesel fuel pump

25 Auxiliary poweroutlet


27 Special equipmentoption

Fuses Usage

28 Airbag

29 Steering wheelsensor

30 Engine controlmodule/Glow plugmodule/Ignition

31 Transmissioncontrol module/Ignition

32 Transmissioncontrol modulebattery

33 Obstacle detection

34 NOx sensors

35 Fuel operatedheater module

36 Fuel system controlmodule battery

41 Transmissioncontrol module 2,battery signal

42 Trailer wiring

43 EV fan clutch


86 Vehicle Care

Fuses Usage

44 Starter solenoid

45 Engine controlmodule, powertrainsignal 1

46 DC-AC inverter

47 Cooling fan – low

51 Left high-beamheadlamp

52 Right high-beamheadlamp

53 Left low-beamheadamp

54 Right low-beamheadlamp

55 Wipers

56 Canister ventsolenoid



61 Crankcase ventheater

Fuses Usage

62 O2 sensor 2/EV fan

63 –

64 Mass airflowsensor/Canistervent/Humiditysensor

65 Ignition coils/injectors - odd

66 Daytime runninglamps 2

67 Daytime runninglamps 1 – uplevel

68 Auxiliary stoplamps

69 Trailer powerextension

70 Upfitter stoplamps

71 Fuel heater/FlexFuel sensor


73 Lighter/Data linkconnector

74 Front blower

Fuses Usage

75 Engine controlmodule, powertrainsignal 3

76 Soot sensor

77 O2 sensor 1/ECMpowertrain signal 2

78 Engine controlmodule/Powertrain

79 Ignition coils/injectors - even

Relays Usage

15 Run/Crank

37 NOx sensors

38 Fuel pump

39 Crank

40 Air conditioning

48 EV fan clutch

49 Powertrain

50 –

57 Cooling fan – low

60 Cooling fan control


Vehicle Care 87

Auxiliary Fuse Block


Fuses Usage

MR-1 Fuel filter heater

MR-2 Diesel exhaust fluidpower

MR-3 Diesel exhaust fluidwake up

Relays Usage

MR Rel 1 Fuel filter heater

MR Rel 2 Diesel exhaust fluidpower/Wake up

Mega Fuse Holder

To check the fuse release the yellowclamps on both sides and pull offthe cover.

Fuse Usage

1 Starter motor

Appearance Care

Exterior CareSee the owner’s manual foradditional exterior care information.

Caution

Water sprayed into or on the airintake box in the enginecompartment may damage the airfilter or electrical components. Donot spray water into or on the airintake box.


88 Service and Maintenance

Service andMaintenance

General InformationGeneral Information . . . . . . . . . . . . 88

Maintenance ScheduleMaintenance Schedule . . . . . . . . 90

Recommended Fluids,Lubricants, and Parts

Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . . 93

Maintenance ReplacementParts . . . . . . . . . . . . . . . . . . . . . . . . . 94

Maintenance RecordsMaintenance Records . . . . . . . . . 95

General InformationThis maintenance section applies tovehicles with a diesel engine. Forgasoline engine vehicles, see themaintenance schedule section inthe owner’s manual.

Your vehicle is an importantinvestment. This section describesthe required maintenance for thevehicle. Follow this schedule to helpprotect against major repairexpenses resulting from neglect orinadequate maintenance. It mayalso help to maintain the value ofthe vehicle if it is sold. It is theresponsibility of the owner to haveall required maintenance performed.

Your dealer has trained technicianswho can perform requiredmaintenance using genuinereplacement parts. They haveup-to-date tools and equipment forfast and accurate diagnostics. Manydealers have extended evening andSaturday hours, courtesytransportation, and onlinescheduling to assist with serviceneeds.

Your dealer recognizes theimportance of providingcompetitively priced maintenanceand repair services. With trainedtechnicians, your dealer is the placefor routine maintenance such as oilchanges and tire rotations andadditional maintenance items liketires, brakes, batteries, and wiperblades.

Caution

Damage caused by impropermaintenance can lead to costlyrepairs and may not be coveredby the vehicle warranty.Maintenance intervals, checks,inspections, recommended fluids,and lubricants are important tokeep the vehicle in good workingcondition.

Do not have chemical flushes thatare not approved by GMperformed on the vehicle. Theuse of flushes, solvents, cleaners,or lubricants that are not

(Continued)


Service and Maintenance 89

Caution (Continued)

approved by GM could damagethe vehicle, requiring expensiverepairs that are not covered bythe vehicle warranty.

The Tire Rotation and RequiredServices are the responsibility of thevehicle owner. It is recommended tohave your dealer perform theseservices every 12 000 km/7,500 mi.Proper vehicle maintenance helps tokeep the vehicle in good workingcondition, improves fuel economy,and reduces vehicle emissions.

Because of the way people usevehicles, maintenance needs vary.There may need to be morefrequent checks and services. TheAdditional Required Services -Normal are for vehicles that:

. Carry passengers and cargowithin recommended limits onthe Tire and Loading Informationlabel. See “Vehicle Load Limits”in the owner’s manual.

. Are driven on reasonable roadsurfaces within legal drivinglimits.

. Use the recommended fuel. SeeFuel for Diesel Engines 0 32.

Refer to the information in theMaintenance Schedule AdditionalRequired Services - Normal chart.

The Additional Required Services -Severe are for vehicles that are:

. Mainly driven in heavy city trafficin hot weather.

. Mainly driven in hilly ormountainous terrain.

. Frequently towing a trailer.

. Used for high speed orcompetitive driving.

. Used for taxi, police, or deliveryservice.

Refer to the information in theMaintenance Schedule AdditionalRequired Services - Severe chart.

{ Warning

Performing maintenance work canbe dangerous and can causeserious injury. Performmaintenance work only if therequired information, proper tools,and equipment are available.If they are not, see your dealer tohave a trained technician do thework. See “Doing Your OwnService Work” in the owner’smanual.



MaintenanceScheduleOwner Checks and Services

See the owner’s manual for otherservices and intervals that may berequired.

At Each Fuel Stop

. Check the engine oil level. SeeEngine Oil 0 69.

Engine Oil Change

When the CHANGE ENGINE OILSOON message displays, have theengine oil and filter changed withinthe next 1 000 km/600 mi. If drivenunder the best conditions, theengine oil life system may notindicate the need for vehicle servicefor up to a year. The engine oil and

filter must be changed at least oncea year and the oil life system mustbe reset. Your trained dealertechnician can perform this work.If the engine oil life system is resetaccidentally, service the vehiclewithin 5 000 km/3,000 mi since thelast service. Reset the oil lifesystem when the oil is changed.See Engine Oil Life System 0 72.

Extended Idle Use

When the vehicle is used in a waythat requires extended idle time,one hour of use shall be deemedthe same as 33 miles. See DriverInformation Center (DIC) 0 13 forhourmeter.

Required Services Every12 000 km/7,500 mi. Check engine oil level and oil

life percentage. If needed,change engine oil and filter, andreset oil life system.See Engine Oil 0 69 andEngine Oil Life System 0 72.

. Check engine coolant level. SeeCooling System 0 74.

. Visually check for fluid leaks.

. Inspect engine air cleaner filter.See Engine Air Cleaner/Filter0 72.

. Visually inspect fuel system fordamage or leaks.

. Visually inspect exhaust systemand nearby heat shields forloose or damaged parts.



Maintenance ScheduleAdditional RequiredServices - Normal

12

00

0k

m/7

,50

0m

i

24

00

0k

m/1

5,0

00

mi

36

00

0k

m/2

2,5

00

mi

48

00

0k

m/3

0,0

00

mi

60

00

0k

m/3

7,5

00

mi

72

00

0k

m/4

5,0

00

mi

84

00

0k

m/5

2,5

00

mi

96

00

0k

m/6

0,0

00

mi

10

80

00

km

/67

,50

0m

i

12

00

00

km

/75

,00

0m

i

13

20

00

km

/82

,50

0m

i

14

40

00

km

/90

,00

0m

i

15

60

00

km

/97

,50

0m

i

16

80

00

km

/10

5,0

00

mi

18

00

00

km

/11

2,5

00

mi

19

20

00

km

/12

0,0

00

mi

20

40

00

km

/12

7,5

00

mi

21

60

00

km

/13

5,0

00

mi

22

80

00

km

/14

2,5

00

mi

24

00

00

km

/15

0,0

00

mi

Perform Required Services. Check engine oillevel and oil life percentage. Change engine oiland filter, if needed.

@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @

Replace engine air cleaner filter. (1) @ @ @

Drain and fill engine cooling system. (2) @

Visually inspect accessory drive belts. (3) @

Replace timing belt. @

Replace fuel filter. (Pickup) (4) @ @ @ @

Replace fuel filter. (Van) (4) @ @ @ @ @

Footnotes — MaintenanceSchedule Additional RequiredServices - Normal

(1) Or every four years, whichevercomes first. If driving in dustyconditions, inspect the filter at eachoil change or more often as needed.See Engine Air Cleaner/Filter 0 72.

(2) Or every five years, whichevercomes first. See Cooling System0 74.

(3) Or every 10 years, whichevercomes first. Inspect for fraying,excessive cracking, or damage;replace, if needed.

(4) Or every two years, or when theCHANGE FUEL FILTER message inthe Driver Information Center (DIC)comes on, whichever comes first.

The fuel filter may need to bereplaced more often based onbiodiesel usage, driving in climateswith severe dust, off-road driving,or towing a trailer for extendedperiods.



Maintenance ScheduleAdditional RequiredServices - Severe

12

00

0k

m/7

,50

0m

i

24

00

0k

m/1

5,0

00

mi

36

00

0k

m/2

2,5

00

mi

48

00

0k

m/3

0,0

00

mi

60

00

0k

m/3

7,5

00

mi

72

00

0k

m/4

5,0

00

mi

84

00

0k

m/5

2,5

00

mi

96

00

0k

m/6

0,0

00

mi

10

80

00

km

/67

,50

0m

i

12

00

00

km

/75

,00

0m

i

13

20

00

km

/82

,50

0m

i

14

40

00

km

/90

,00

0m

i

15

60

00

km

/97

,50

0m

i

16

80

00

km

/10

5,0

00

mi

18

00

00

km

/11

2,5

00

mi

19

20

00

km

/12

0,0

00

mi

20

40

00

km

/12

7,5

00

mi

21

60

00

km

/13

5,0

00

mi

22

80

00

km

/14

2,5

00

mi

24

00

00

km

/15

0,0

00

mi

Perform Required Services. Check engine oillevel and oil life percentage. Change engine oiland filter, if needed.

@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @

Replace engine air cleaner filter. (1) @ @ @

Change automatic transmission fluid and filter. @ @ @

Drain and fill engine cooling system. (2) @

Visually inspect accessory drive belts. (3) @

Replace timing belt. @

Replace fuel filter. (Pickup) (4) @ @ @ @

Replace fuel filter. (Van) (4) @ @ @ @ @

Footnotes — MaintenanceSchedule Additional RequiredServices - Severe

(1) Or every four years, whichevercomes first. If driving in dustyconditions, inspect the filter at eachoil change or more often as needed.See Engine Air Cleaner/Filter 0 72.

(2) Or every five years, whichevercomes first. See Cooling System0 74.

(3) Or every 10 years, whichevercomes first. Inspect for fraying,excessive cracking, or damage;replace, if needed.

(4) Or every two years, or when theCHANGE FUEL FILTER message inthe Driver Information Center (DIC)

comes on, whichever comes first.The fuel filter may need to bereplaced more often based onbiodiesel usage, when driving inclimates with excessive dust,or when off-road driving or towing atrailer for extended periods.



Recommended Fluids, Lubricants, and Parts

Recommended Fluids and LubricantsThe following fluids apply to vehicles with a Duramax diesel engine. For other fluids not listed here, see“Recommended Fluids and Lubricants” in the owner’s manual.

Fluids and lubricants identified below by name, part number, or specification can be obtained from your dealer.

Usage Fluid/Lubricant

Automatic Transmission (6 Speed) DEXRON-VI Automatic Transmission Fluid.

Automatic Transmission (8 Speed) DEXRON-HP Automatic Transmission Fluid.

Diesel Exhaust AftertreatmentSystem

Diesel Exhaust Fluid (GM Part No. 19286291, in Canada 88862660) ordiesel exhaust fluid that meets ISO 22241 or displays the API DieselExhaust Fluid Certification Mark.

Engine Coolant 50/50 mixture of clean, drinkable water and use only DEX-COOL coolant.See Cooling System 0 74.

Engine Oil Engine oil meeting the dexos2 specification of the proper SAE viscositygrade. ACDelco dexos2 is recommended. See Engine Oil 0 69.

Hydraulic Power Steering System (IfEquipped)

GM Power Steering Fluid (GM Part No. 19329450, in Canada 19329451).



Maintenance Replacement PartsReplacement parts identified below by name, part number, or specification can be obtained from your dealer.

Part GM Part Number ACDelco Part Number

Engine Air Cleaner/Filter

4-Cylinder Pickup 23248945 A3216C

4-Cylinder Van 84000015 A3221C

Fuel Filter

4-Cylinder Pickup 52100212 TP1007

4-Cylinder Van 84186990 TP1016

Engine Oil Filter

4-Cylinder Pickup 12679114 PF2262G

4-Cylinder Van 12677407 PF2267G

Use only the specified filters.



Maintenance RecordsAfter the scheduled services are performed, record the date, odometer reading, who performed the service, and thetype of services performed in the boxes provided. Retain all maintenance receipts.

DateOdometerReading

Serviced By Services Performed


96 Technical Data

Technical Data

Vehicle DataCapacities and

Specifications . . . . . . . . . . . . . . . . 97Engine Drive Belt Routing . . . . . 99


Technical Data 97

Vehicle Data

Capacities and SpecificationsThe following approximate capacities are given in metric and English conversions. See Recommended Fluids andLubricants 0 93.

Application

Capacities

Metric English

Engine Cooling System (Pickup Models)

2.8L 4-Cylinder Engine 10.5 L 11.1 qt

Engine Cooling System (2.8L 4-Cylinder Van Models)

Front Heater Core without Fuel Operated Heater (FOH) 13.7 L 14.4 qt

Front Heater Core with Fuel Operated Heater (FOH) 13.9 L 14.7 qt

Front and Rear Heater Core without Fuel OperatedHeater (FOH)

15.8 L 16.7 qt

Front and Rear Heater Core with Fuel OperatedHeater (FOH)

16.0 L 16.9 qt

Diesel Exhaust Fluid (DEF) Tank*

2.8L 4-Cylinder Pickup Models (LWN) 20.4 L 5.4 gal

2.8L 4-Cylinder Van Models (LWN) 21.0 L 5.5 gal


98 Technical Data

Application

Capacities

Metric English

Engine Oil with Filter

2.8L 4-Cylinder Engine 5.6 L 6.0 qt

*Do not overfill the DEF tank. See Diesel Exhaust Fluid 0 27.

All quantities are approximate. When adding, be sure to fill to the appropriate level, as recommended in thismanual. Recheck fluid level after filling.

Engine cooling system capacity values are based on the entire cooling system and its components.

Engine Specifications

Engine VIN Code Type

2.8L 4-Cylinder Turbo Diesel (LWN Engine) 1 L4


Technical Data 99

Engine Drive Belt Routing

2.8L 4-Cylinder Engine (Pickup)

2.8L 4-Cylinder Engine (Van)


100 Index

Index AAccessories and Modifications . . . 64Air Cleaner/Filter, Engine . . . . . . . . 72Appearance Care

Exterior . . . . . . . . . . . . . . . . . . . . . . . . .87Automatic

Transmission Fluid . . . . . . . . . . . . .72

BBattery . . . . . . . . . . . . . . . . . . . . . . . . . . 78Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . 33Brake

Exhaust . . . . . . . . . . . . . . . . . . . . . . . .30

CCanadian Vehicle Owners . . . . . . . . 2Capacities and Specifications . . . . 97Check

Engine Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . 11

CleaningExterior Care . . . . . . . . . . . . . . . . . . .87

Cluster, Instrument . . . . . . . . . . . . . . . 6Cold Weather Operation . . . . . . . . . 34Cooling System . . . . . . . . . . . . . . . . . . 74Covers

Winter . . . . . . . . . . . . . . . . . . . . . . . . . .19

DDiesel

Starting Your Engine . . . . . . . . . . . .16Diesel Exhaust Fluid . . . . . . . . . . . . . 27Diesel Exhaust Fluid (DEF)

Warning Light . . . . . . . . . . . . . . . . . . 13Diesel Particulate Filter . . . . . . . . . . 24Drive Belt Routing, Engine . . . . . . . 99Driver Information

Center (DIC) . . . . . . . . . . . . . . . . . . . 13

EElectrical System

Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . .79

EngineAir Cleaner/Filter . . . . . . . . . . . . . . .72Check Light (Malfunction

Indicator) . . . . . . . . . . . . . . . . . . . . . . 11Compartment Overview . . . . . . . . .66Cooling System . . . . . . . . . . . . . . . . .74Drive Belt Routing . . . . . . . . . . . . . .99Heater . . . . . . . . . . . . . . . . . . . . . . . . . .21Oil Life System . . . . . . . . . . . . . . . . .72Oil Pressure Gauge . . . . . . . . . . . .10Overheating . . . . . . . . . . . . . . . . . . . .77Starting Your Diesel . . . . . . . . . . . .16


Index 101

EnginesDiesel Fuel . . . . . . . . . . . . . . . . . . . . .32

Exhaust Brake . . . . . . . . . . . . . . . . . . . 30Exhaust Fluid

Diesel . . . . . . . . . . . . . . . . . . . . . . . . . .27

FFilter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Replacement (Fuel) . . . . . . . . . . . . .38Filter,

Engine Air Cleaner . . . . . . . . . . . . .72Fluid

Automatic Transmission . . . . . . . .72Fuel

Additives . . . . . . . . . . . . . . . . . . . . . . .32Biodiesel . . . . . . . . . . . . . . . . . . . . . . .33Cold Weather Operation . . . . . . . .34Diesel Engines . . . . . . . . . . . . . . . . .32Filling a Portable Fuel

Container . . . . . . . . . . . . . . . . . . . . .41Filling the Tank . . . . . . . . . . . . . . . . .40Filter Replacement . . . . . . . . . . . . .38Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Operated Heater (FOH) . . . . . . . . .23Running out of Fuel . . . . . . . . . . . . .38Top Tier . . . . . . . . . . . . . . . . . . . . . . . .31Water in Fuel . . . . . . . . . . . . . . . . . . .34

Fuel for Diesel Engines . . . . . . . . . . 32

FusesEngine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . . . . . .79

GGauges

Engine Oil Pressure . . . . . . . . . . . .10Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

General InformationService and Maintenance . . . . . . .88

HHeater

Engine . . . . . . . . . . . . . . . . . . . . . . . . . .21Fuel Operated . . . . . . . . . . . . . . . . . .23

IInstrument Cluster . . . . . . . . . . . . . . . . 6Introduction . . . . . . . . . . . . . . . . . . . . . . . 2

LLamps

Malfunction Indicator (CheckEngine) . . . . . . . . . . . . . . . . . . . . . . . 11

LightsCheck Engine (Malfunction

Indicator) . . . . . . . . . . . . . . . . . . . . . . 11Diesel Exhaust Fluid (DEF) . . . . .13Power Take-off . . . . . . . . . . . . . . . . .13Wait to Start . . . . . . . . . . . . . . . . . . . .12

MMaintenance

Records . . . . . . . . . . . . . . . . . . . . . . . .95Maintenance Schedule . . . . . . . . . . 90

Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . . .93

Malfunction Indicator Lamp . . . . . . 11

OOil

Engine . . . . . . . . . . . . . . . . . . . . . . . . . .69Engine Oil Life System . . . . . . . . .72Engine Oil Pressure Gauge . . . . .10

Overheating, Engine . . . . . . . . . . . . . 77

PParking

Over Things That Burn . . . . . . . . .24Personalization

Vehicle . . . . . . . . . . . . . . . . . . . . . . . . .14Power Take-Off (PTO) . . . . . . . . . . . 46Power Take-Off Light . . . . . . . . . . . . 13

RRecommended Fluids and

Lubricants . . . . . . . . . . . . . . . . . . . . . . 93Records

Maintenance . . . . . . . . . . . . . . . . . . . .95


102 Index

Replacement PartsMaintenance . . . . . . . . . . . . . . . . . . . .94

Routing, Engine Drive Belt . . . . . . . 99Running out of Fuel . . . . . . . . . . . . . . 38

SService

Accessories andModifications . . . . . . . . . . . . . . . . . .64

Maintenance Records . . . . . . . . . .95Maintenance, General

Information . . . . . . . . . . . . . . . . . . . .88Specifications and Capacities . . . . 97Starting the Diesel Engine . . . . . . . 16Supplement

Using . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

TTop Tier Fuel . . . . . . . . . . . . . . . . . . . . 31Towing

Trailer . . . . . . . . . . . . . . . . . . . . . . . . . .42Trailer

Towing . . . . . . . . . . . . . . . . . . . . . . . . . .42Transmission

Fluid, Automatic . . . . . . . . . . . . . . . .72

UUsing This Supplement . . . . . . . . . . . 2

VVehicle

Canadian Owners . . . . . . . . . . . . . . . 2Personalization . . . . . . . . . . . . . . . . .14

WWait to Start Light . . . . . . . . . . . . . . . 12Water in Fuel . . . . . . . . . . . . . . . . . . . . 34Winter Cover . . . . . . . . . . . . . . . . . . . . 19

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