Chevrolet GMC 6.6L Duramax Diesel 2020 Supplement Manual Download

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6.6L Duramax Diesel

Engine Supplement

84458631 A

CMY

20_MUL_6.6L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458631A_2019APR11.ai 1 3/21/2019 11:06:49 AM

Summary of Contents for GMC 6.6L Duramax Diesel 2020

Page 1: ...84458631 A C M Y CM MY CY CMY K 20_MUL_6 6L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458631A_2019APR11 ai 1 3 21 2019 11 06 49 AM 20_MUL_6 6L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458631A_2019APR11 ai 1 3 21 2019 11 06 49 AM ...

Page 2: ...ax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 Contents Introduction 2 Instruments and Controls 5 Driving and Operating 15 Vehicle Care 60 Service and Maintenance 79 Technical Data 88 Index 92 ...

Page 3: ...se documentation relating to your specific vehicle to confirm the features This manual contains information that pertains to the operation of your diesel engine It also contains your Diesel Maintenance Schedule The sections in this manual correspond to the sections in your owner s manual This manual along with your owner s manual will assist you in the proper use and maintenance of your vehicle Ke...

Page 4: ...MNA Localizing U S Canada 13337828 2020 CRC 4 17 19 Introduction 3 Index A good place to look for what you need is the Index in the back of this supplement It is an alphabetical list of what is in the supplement and the page number where you will find it ...

Page 5: ...Chevrolet GMC 6 6L Duramax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 4 Introduction 2 NOTES ...

Page 6: ...s 5 Instruments and Controls Warning Lights Gauges and Indicators Instrument Cluster 6 Malfunction Indicator Lamp Check Engine Light 10 Wait to Start Light 11 Diesel Exhaust Fluid DEF Warning Light 11 Power Take Off Light 12 Information Displays Driver Information Center DIC 12 Vehicle Personalization Vehicle Personalization 13 ...

Page 7: ...Duramax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 6 Instruments and Controls Warning Lights Gauges and Indicators Instrument Cluster Base Level Chevrolet English Cluster Metric Similar ...

Page 8: ...Chevrolet GMC 6 6L Duramax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 Instruments and Controls 7 Base Level GMC English Cluster Metric Similar ...

Page 9: ...Chevrolet GMC 6 6L Duramax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 8 Instruments and Controls Uplevel GMC English Cluster Metric Similar ...

Page 10: ...Chevrolet GMC 6 6L Duramax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 Instruments and Controls 9 Uplevel Chevrolet English Cluster Metric Similar ...

Page 11: ...s driven continually with this light on the emission control system may not work as well the fuel economy may be lower and the vehicle may not run smoothly This could lead to costly repairs that might not be covered by the vehicle warranty Caution Modifications to the engine transmission exhaust intake or fuel system or the use of replacement tires that do not meet the original tire specifications...

Page 12: ...tems have not been completely diagnosed If this happens the vehicle would not be ready for inspection and might require several days of routine driving before the system is ready for inspection This can happen if the 12 volt battery has recently been replaced or run down or if the vehicle has recently been serviced See your dealer if the vehicle will not pass or cannot be made ready for the test W...

Page 13: ... illuminate from Empty E to Full F When LOW appears on the display and the segments turn red add DEF as soon as possible For a guide on how much DEF to add see Diesel Exhaust Fluid 0 25 Fuel Filter Life Remaining This display shows an estimate of the fuel filter s remaining useful life If 90 Fuel Filter Life Remaining is displayed it means 90 of the current fuel filter life remains The fuel filter...

Page 14: ... menus for customizing vehicle features The following features may be available on some vehicles with a diesel engine See Vehicle Personalization in the owner s manual for additional vehicle personalizations If equipped these features may be selected using the infotainment display To access the vehicle personalization menu 1 Touch the Settings icon on the Home Page of the infotainment display 2 To...

Page 15: ...Standby Set 1 setting SET 2 SPEED This feature is available if the vehicle is configured for stationary preset PTO and allows the selection of the PTO set 2 speed Select the desired PTO Standby Set 2 setting TAP STEP SPEED This feature is available if the vehicle is configured for stationary variable or mobile PTO and allows the selection of the PTO tap step speed Select the desired PTO Tap Step S...

Page 16: ...er Operation 32 Water in Fuel 33 Running Out of Fuel 36 Fuel Filter Replacement 36 Filling the Tank 37 Filling a Portable Fuel Container 39 Trailer Towing Trailer Towing 39 Conversions and Add Ons Power Take Off PTO 41 Starting and Operating Starting the Diesel Engine The diesel engine starts differently than a gasoline engine Caution If the steering wheel is turned until it reaches the end of its...

Page 17: ...es not start after 15 seconds of cranking turn the ignition off Wait one minute for the cranking motor to cool then try the same steps again If you are trying to start the engine after you have run out of fuel follow the steps in Running Out of Fuel 0 36 When the engine is cold let it run for a few minutes before driving This lets oil pressure build up The engine will sound louder when it is cold ...

Page 18: ...eds service Warning Do not use gasoline or starting aids such as ether in the air intake They could damage the engine which may not be covered by the vehicle warranty They could also cause a fire which could cause serious personal injury Engine Idle Variations Under certain conditions the engine idle speed can vary or be elevated Change in idle speed is normal and does not indicate a problem Norma...

Page 19: ...ise control Set switch is pressed and released for Preset Fast Idle Speed 1200 rpm Fast Idle control will be disabled when one or more of the following conditions occur The cruise control Set switch is pressed and released See Cruise Control in the owner s manual The cruise control Cancel switch is pressed The brake pedal is pressed The transmission is shifted out of P Park or N Neutral The parkin...

Page 20: ... cover does not cover some sections of the front of the vehicle to provide enough airflow When the winter cover is used the outside air temperature display may not function properly Keep the underside of the winter cover as clean as possible Remove monthly or as necessary and clean away dust and debris Use only a mild soap to clean Do not use harsh soap strong detergents or vinyl protectant sealan...

Page 21: ...lizing U S Canada 13337828 2020 CRC 4 17 19 20 Driving and Operating 2 Starting in the middle attach fastening points as illustrated 3 To remove reverse the steps listed previously Installation GMC Pickup 1 The white label must be at the top and back of the cover ...

Page 22: ...d previously Engine Heater Warning Do not plug in the engine block heater while the vehicle is parked in a garage or under a carport Property damage or personal injury may result Always park the vehicle in a clear open area away from buildings or structures If equipped the engine heater can provide easier starting in cold weather conditions at or below 18 C 0 F For engine heater operation see Engi...

Page 23: ...ilpipe and the openings where fresh air enters the cooler The DPF will clean itself as part of normal operation Several factors including fuel consumed hours of engine operation and miles driven are monitored by the Engine Control Module ECM The self cleaning occurs approximately once per tank of fuel Vehicles with the DPF have specific fuel and engine oil requirements See Fuel for Diesel Engines ...

Page 24: ... in the exhaust sound and engine idle speed Along with this a burning smell and reduction in fuel economy may be noticed This is normal If the vehicle is idled or driven on very short trips with the DPF warning message on and the exhaust filter is not cleaned as required the malfunction indicator lamp and a DIC message will display See your dealer Also see Malfunction Indicator Lamp Check Engine L...

Page 25: ...lammable materials near the muffler DPF and exhaust pipe which may result in a fire The temperature of exhaust gases is high enough to burn you You and others could be seriously injured Before starting manual regeneration make sure all of the following safety conditions are met The vehicle is parked on level ground away from any flammable materials The vehicle is parked outdoors away from any wall...

Page 26: ...age indicates that cleaning is in progress A DIC message will display when cleaning is complete Cleaning could take up to 30 minutes Upon completion the engine will return to normal idle but exhaust components will remain hot for several minutes Do not move the vehicle until the exhaust has had time to cool Manual regeneration can be canceled at any time by pressing the brake pedal or by turning t...

Page 27: ...ar the DEF system purge fluid back into the tank after the vehicle is shut off Locating Diesel Exhaust Fluid DEF can be purchased at your authorized dealers Additionally some diesel truck fueling stations or retailers may have DEF for purchase For vehicles with an active OnStar or connected services plan OnStar can help to locate a DEF retailer See Customer Assistance Offices in the owner s manual...

Page 28: ... If DEF is added under freezing conditions it may require less fluid to fill the DEF tank When fluid reaches the top of the DEF fill pipe stop filling Do not top off the DEF tank If using a bottle or jug to refill DEF follow the instructions on the container label and use a dedicated fill aid Caution Do not overfill the DEF tank and do not allow DEF to contact the finished surfaces of the vehicle ...

Page 29: ...e ignored and the DEF tank becomes empty the DIC will display messages that describe the action needed and distance until vehicle speed is limited For the DEF warning light symbol see Diesel Exhaust Fluid DEF Warning Light 0 11 DEF Quality Poor Use only DEF that is GM approved or fluid containing the API certified or ISO 22241 label DEF has an expiration date If the system detects poor quality or ...

Page 30: ...ngth of time the brakes are applied and the rate the vehicle is slowing The system delivers the correct amount of braking to assist in vehicle control The heavier the vehicle load the more active the engine exhaust brake will be Use of the exhaust brake will help maintain vehicle speed when used with cruise control See Cruise Control in the owner s manual Automatic downshifts will not occur if the...

Page 31: ...efueling GM recommends adding ACDelco Fuel System Treatment Plus Diesel to help clean engine deposits This is available only at your GM dealer Fuel for Diesel Engines The selection of a high quality fuel is important for maintaining optimum vehicle performance Diesel fuel should meet or exceed the minimum requirements in the most current versions of the local fuel standards Do not use fuel with mo...

Page 32: ...adversely impact vehicle starting Severe winter grade diesel fuel such as 1 D diesel fuel or Arctic grade diesel fuel can be used in extreme cold temperatures below 18 C or 0 F however doing so will reduce power and fuel economy Avoid using severe winter grade fuel in warm or hot climates It can result in stalling poor starting and damage to the fuel injection system Fuels improperly blended for c...

Page 33: ...uel More frequent refueling provides the best opportunity to have a supply of fresh fuel Storage at hot ambient temperatures will accelerate biodiesel degradation If the vehicle is not driven often and uses little fuel or if it is stored for extended periods of time avoid the use of biodiesel blended fuels above 5 by volume When the vehicle is stored for longer than one month it should be run out ...

Page 34: ...d If the fuel needs to be drained keep sparks flames and smoking materials away from the mixture Caution Water in the diesel fuel can corrode internal components of the fuel system and lead to severe damage It can also support fungus or bacteria growth which can damage the fuel system Even with a diesel fuel biocide the fuel system may still need to be cleaned Your dealer can advise of the appropr...

Page 35: ...ately after refueling message displays and stays on A large amount of water is in the fuel tank Drain the fuel filter immediately If the message stays on or comes back on without refueling then fuel tank purging is required See your dealer If the message displays and the engine stalls or runs rough do not drive until the water contaminated fuel is drained Caution Driving with this message on can d...

Page 36: ... fuel If air gets in the fuel lines need to be primed before operating the vehicle If air is present the following may have happened The vehicle ran out of fuel The fuel filter was removed The fuel lines were removed or disconnected The fuel filter water drain valve was opened while the engine was running Priming the Fuel System There is an electric priming pump that will bring fuel to the engine ...

Page 37: ...ue to running out of fuel it may take a few drive cycles to clear Fuel Filter Replacement Warning Diesel fuel is flammable It could start a fire if something ignites it and people could be burned Do not let it get on hot engine parts and keep matches or other ignition 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 filt...

Page 38: ...ued Warning Continued Follow these guidelines to help avoid injuries to you and others Read and follow all the instructions on the fuel pump island Turn off the engine when refueling Keep sparks flames and smoking materials away from fuel Do not leave the fuel pump unattended Avoid using electronic devices while refueling Do not re enter the vehicle while pumping fuel Continued Warning Continued K...

Page 39: ...l fuel can foam when filling the tank The automatic pump nozzle may shut off even if the tank is not full Wait for the foaming to stop and then fill the tank more slowly Be careful not to spill fuel Wait five seconds after pumping before removing the fill nozzle Clean fuel from painted surfaces as soon as possible See Exterior Care 0 78 Reinstall the cap by turning it clockwise until it clicks Pus...

Page 40: ...f the container before dispensing fuel and keep it in contact with the fill opening until filling is complete Fill the container no more than 95 full to allow for expansion Do not smoke light matches or use lighters while pumping fuel Do not use electronic devices while pumping fuel Trailer Towing When towing at high elevation on steep uphill grades consider the following Engine coolant at higher ...

Page 41: ... 10 15 of the total loaded trailer 2 Do not exceed the maximum allowable tongue weight for the vehicle Choose the shortest hitch extension that will position the hitch ball closest to the vehicle This will help reduce the effect of trailer tongue weight on the rear axle Trailer rating may be limited by the vehicle s ability to carry tongue weight Tongue or kingpin weight cannot cause the vehicle t...

Page 42: ...ght side positions When installing PTO aftermarket equipment the PTO wiring and operation recommendations provided by the service manual and GM Upfitter documentation must be strictly followed Refer to the bulletins in the GM Upfitter Integration website www gmupfitter com for the PTO Operating Description and Application Guide Warning Engine exhaust contains Carbon Monoxide CO which cannot be see...

Page 43: ...s available via the GM Service Tool only During the configuration of OSIM two modes must be paired stationary preset and mobile or stationary variable and mobile During activation of OSIM one of the two modes within the pre configured pairing must be selected If an OSIM mode is not selected PTO will not operate OSIM modes of operation are Stationary The configuration may be stationary preset or st...

Page 44: ... Speeds Standby 900 rpm Set 1 SET 1200 rpm Set 2 RES 1900 rpm The first time PTO is used 1 The PTO Control setting on the GM Service Tool is programmed to Interior Mode PTO Switch 2 Check the correct operation of the default PTO preset stationary mode to observe the three idle up speeds The PTO function should be confirmed before any wiring modifications are done or any reprogramming is attempted ...

Page 45: ...gramming with the GM Service Tool and remote switch panel provided by GM Upfitter To start remote operation in cab 1 With the engine running shift the vehicle into P Park release the brake pedal and set the parking brake 2 Confirm cruise control is off 3 Confirm the hood is closed 4 Press and release the in cab PTO switch 5 The horn will chirp the PTO clutch will engage and the engine will advance...

Page 46: ...ruise control to select the PTO Set 2 speed Variable PTO Variable Enable Conditions In Cab Operation This requires programming with the GM Service Tool To enable PTO 1 With the engine running shift the vehicle into P Park release the brake pedal and set the parking brake Make sure Cruise Control is off 2 Press and release the PTO in cab switch below the climate controls in the center stack The PTO...

Page 47: ...ove the key from the ignition or the RKE transmitter from the vehicle before operating Remote PTO unless the Remote Operation In Cab Enable feature is used Variable Enable Conditions Remote Operation In Cab Enable Starting Remote Operation from In Cab This requires programming with the GM Service Tool and remote switch panel provided by GM Upfitter 1 With the engine running shift the vehicle into ...

Page 48: ...e PTO indicator light will change to solid 6 Tap RES and SET on the cruise control for the desired operating speed The first elevated engine speed PTO Standby Speed is intended as verification that the system is active and ready to go to a working speed The engine speeds can be adjusted between the low of PTO Standby Speed and the high of PTO Max Engine Speed limits Both values can be modified wit...

Page 49: ...ccelerator pedal to temporarily adjust the engine speed RES or SET on the cruise control can be used to tap up or down or if continuously held to ramp up or down to the desired operating speed Top limit is PTO Max Engine Speed default 2100 rpm and programmable to 3100 rpm Lower limit is PTO Standby Speed default 900 rpm with program range from base idle to 900 rpm The accelerator pedal can be used...

Page 50: ... speed Press the PTO in cab switch The PTO clutch disengages and the engine returns to base idle The PTO indicator light will turn off indicating the PTO clutch is disengaged and the stored set speed has been cleared from memory Stationary Modes Preset or Variable Remote Control To disengage PTO Open the Remote PTO Engine Start Shutdown switch The PTO clutch disengages and the engine will stop If ...

Page 51: ...locked A shift out of P Park will not be allowed while the engine is running and PTO is active until one of the following actions is taken Press the brake pedal PTO will disengage Engine will run at idle speed and shift lever can be shifted from P Park Press the PTO in cab switch only if the PTO in cab Remote Start Stop feature is enabled This requires programming with the GM Service Tool PTO will...

Page 52: ...eed is cleared for the above actions Although the PTO system attempts to limit accelerator and PTO switch inputs to comply with maximum speed and or rpm parameters some vehicle operating conditions such as downhill acceleration can cause the vehicle speed or engine rpm to exceed these limits In those cases the PTO system may disengage Operator Selectable In Cab Mode OSIM To disable OSIM Stationary...

Page 53: ...n COAST Press and hold SET on the cruise control to reduce the rpm at 148 rpm sec until the desired engine speed is reached or until the initial PTO Standby Speed is reached Use Set 1 Switch in Remote Mode The speed change will happen after three seconds of holding SET or Set 1 switch In Cab Cruise Control RES or Remote PTO Set 2 Switch RESUME After a PTO set speed has been met a Resume Speed mess...

Page 54: ...mable Parameters Factory Setting Minimum Value Maximum Value PTO Option Configuration VEHICLE STATIONARY PRESET SPEED VEHICLE STATIONARY PRESET SPEED VEHICLE STATIONARY VARIABLE SPEED VEHICLE MOBILE VARIABLE SPEED PTO Control In Cab PTO Mode In Cab PTO Mode Remote PTO Mode Operator In Cab Selectable Mode OSIM Type of Set Switch Operation MOMENTARY MOMENTARY LATCHING PTO SET 1 Engine Speed After PT...

Page 55: ...ETURN TO BASE IDLE rpm RETURN TO BASE IDLE rpm RETURN TO STANDBY rpm Max vehicle speed may be limited to 40 km h 25 mph if this is programmed with the GM Service Tool After reverting back to RETURN TO BASE IDLE rpm using the GM Service Tool Max vehicle speed is also to be set to required speed Set Low Fuel Level for Engine Shutdown 15 0 25 Engine Run Time with PTO Active Timer ENABLED DISABLED ENA...

Page 56: ... 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 1700 rpm 3100 rpm Engine Speed Tap Step 100 rpm 4 rpm 500 rpm Engine Speed Ramp Rate 148 rpm s 4 rpm s 148 rpm s Maximum Vehicle Speed 94 km h 58 mph 30 km h 19 mph 94 km h 58 mph Minimum Remote Potentiometer Threshold 2 0 50 Maximum Remote Potentiometer Threshold 95 50 100 Remote...

Page 57: ...PTO STANDBY STANDBY SPEED SET SPEED 1 or SET SPEED 2 Remote Set Switch Transition to High Voltage 67 of Ignition Voltage SET SPEED 2 STANDBY SPEED SET SPEED 1 or SET SPEED 2 Horn Chirps during a Remote Start Event ENABLED DISABLED ENABLED Standby Speed Menu ENABLED DISABLED ENABLED Set 1 Speed Menu In Stationary Preset ENABLED DISABLED ENABLED Set 2 Speed Menu In Stationary Preset ENABLED DISABLED...

Page 58: ...le and Mobile ENABLED DISABLED ENABLED Remote Set Switch Speed Control DISABLED DISABLED ENABLED Remote Throttle Speed Control DISABLED DISABLED ENABLED Remote Engine Start DISABLED DISABLED ENABLED Remote Engine Shutdown DISABLED DISABLED ENABLED Throttle Override ENABLED DISABLED ENABLED Throttle Override Timer 10 Minutes 1 Minute 13 Minutes Driver Door Status Usage ENABLED DISABLED ENABLED Remo...

Page 59: ... remain on throughout the PTO operating cycle Additional in vehicle PTO module information can be accessed by the dealer Also see the service manual for more information Your dealer can access Service Tool information to determine why PTO may not engage and why PTO may unexpectedly disengage due to system conditions See www gmupfitter com for information on the installation of wiring and programmi...

Page 60: ...ve 50 km h 30 mph for about 30 minutes Manual regeneration can be used during a stationary PTO session However it is strongly recommended that the exhaust filter be cleaned before continuous PTO If manual regeneration is operating concurrently with PTO then the PTO system will retain control of the engine speed Low PTO engine speeds will cause regeneration to take longer To initiate a manual DPF r...

Page 61: ...ion or damage not covered by the vehicle warranty Damage to vehicle components resulting from modifications or the installation or use of non GM certified parts including control module or software modifications is not covered under the terms of the vehicle warranty and may affect remaining warranty coverage for affected parts GM Accessories are designed to complement and function with other syste...

Page 62: ...mage create failure or reduce the life of the engine engine emission system transmission and drivetrain Damage failure or reduced life of the engine transmission emission system drivetrain or other vehicle components caused by aftermarket engine performance enhancement products or modifications might not be covered under the vehicle warranty ...

Page 63: ...Chevrolet GMC 6 6L Duramax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 62 Vehicle Care Vehicle Checks Engine Compartment Overview ...

Page 64: ...ng Engine Oil and When to Add Engine Oil in this section Change the engine oil at the appropriate time See Engine Oil Life System in the owner s manual Always dispose of engine oil properly See What to Do with Used Oil in this section Checking Engine Oil Check the engine oil level regularly every 650 km 400 mi especially prior to a long trip The engine oil dipstick handle is a loop See Engine Comp...

Page 65: ...levels above or below the acceptable operating range shown on the dipstick are harmful to the engine If the oil level is above the operating range i e the engine has so much oil that the oil level gets above the cross hatched area that shows the proper operating range the engine could be damaged Drain the excess oil or limit driving of the vehicle and seek a service professional to remove the exce...

Page 66: ...hen it is very cold below 18 C 0 F use SAE 5W 40 to improve cold starting These numbers on the oil container show its viscosity or thickness When selecting an oil of the appropriate viscosity grade always select an oil of the correct specification See Specification earlier in this section Engine Oil Additives Engine Oil Flushes API Do not add anything to the oil The recommended oils with the API s...

Page 67: ...sually not necessary to check the transmission fluid level The only reason for fluid loss is a transmission leak or overheated transmission This vehicle is not equipped with a transmission fluid level dipstick There is a special procedure for checking and changing the transmission fluid in these vehicles Because this procedure is difficult this should be done at your dealer Contact your dealer for...

Page 68: ... or the reset stem to confirm the reset Engine Air Cleaner Filter The engine air cleaner filter is in the engine compartment See Engine Compartment Overview 0 62 When to Inspect the Engine Air Cleaner Filter If the vehicle is not equipped with the engine air filter life system see Maintenance Schedule 0 81 for intervals on inspecting and replacing the engine air cleaner filter How to Inspect Repla...

Page 69: ... cleaner filter from the housing base Take care to dislodge as little dirt as possible 6 Turn the dust valve counterclockwise to remove from the front intake air duct Check it for debris and clean out if necessary 7 Turn the dust valve clockwise to reinstall 8 Clean the air cleaner filter sealing surface and the housing base 9 Install the engine air cleaner filter 10 Lower the air cleaner filter h...

Page 70: ... Cap 3 Engine Coolant Surge Tank and Pressure Cap Warning Do not touch heater or radiator hoses or other engine parts They can be very hot and can burn you Do not run the engine if there is a leak all coolant could Continued Warning Continued leak out That could cause an engine fire and can burn you Fix any leak before driving the vehicle Engine Coolant The cooling system in the vehicle is filled ...

Page 71: ... four times a year have your dealer check the vehicle cooling system Caution Do not use anything other than a mix of DEX COOL coolant that meets GM Standard GMW3420 and clean drinkable water Anything else can cause damage to the engine cooling system and the vehicle which would not be covered by the vehicle warranty Never dispose of engine coolant by putting it in the trash or by pouring it on the...

Page 72: ...ap even a little can cause them to come out at high speed and you could be burned Never turn the cap when the cooling system including the pressure cap is hot Wait for the cooling system and pressure cap to cool If no coolant is visible in the surge tank add coolant as follows 1 Remove the coolant surge tank pressure cap when the cooling system including the coolant surge tank pressure cap and upp...

Page 73: ... coolant fill procedure Steps 1 6 If the coolant level is still low after having followed these steps twice have the coolant system checked by a certified technician at the dealer for a possible leak Caution If the pressure cap is not tightly installed coolant loss and engine damage may occur Be sure the cap is properly and tightly secured Cooling System Low Temperature Cooling Circuit The cooling...

Page 74: ... Use Warning Plain water or other liquids such as alcohol can boil before the proper coolant mixture will With plain water or the wrong mixture the engine could get too hot but there would not be an overheat warning The engine could catch fire and you or others could be burned Use a 50 50 mixture of clean drinkable water and DEX COOL coolant which will not damage aluminum parts If using this mixtu...

Page 75: ...rtment Warning Steam and scalding liquids from a hot cooling system are under pressure Turning the pressure cap even a little can cause them to come out at high speed and you could be burned Never turn the cap when the cooling system including the pressure cap is hot Wait for the cooling system and pressure cap to cool Caution Do not run the engine if there is a leak in the engine cooling system T...

Page 76: ... out of the vehicle until it cools down If the Action Required Idle Vehicle To Cool Engine DIC message displays do not turn the engine off Keep the engine running until the message goes away Intended Vehicle Use After a Heavy Towing Event If equipped when the vehicle is turned off after towing heavy loads the system may automatically restart the engine A chime will sound and DIC messages will disp...

Page 77: ...ould be restarted then the manual regen feature will not be allowed If manual regen has been enabled and the system has determined that the engine should be restarted there will be no chime or DIC messages related to the Diesel Engine After Run Feature until the manual regen completes If the engine is turned off during the manual regen a restart may occur without any alerts Engine Fan The vehicle ...

Page 78: ... the vehicle may damage it Always keep the covers on any electrical component A fuse puller is available in the left instrument panel end cap The vehicle may not be equipped with all the fuses relays and features shown Danger Fuses and circuit breakers are marked with their ampere rating Do not exceed the specified amperage rating when replacing fuses and circuit breakers Use of an oversized fuse ...

Page 79: ...el heater 3 100 watt pump LD 4 Powertrain sensor LD 5 Cooling fan clutch HD 6 Powertrain sensor HD Appearance Care Exterior Care See the owner s manual for additional exterior care information Caution Water sprayed into or on the air intake box in the engine compartment may damage the air filter or electrical components Do not spray water into or on the air intake box ...

Page 80: ...ibility of the owner to have all required maintenance performed Your dealer has trained technicians who can perform required maintenance using genuine replacement parts They have up to date tools and equipment for fast and accurate diagnostics Many dealers have extended evening and Saturday hours courtesy transportation and online scheduling to assist with service needs Your dealer recognizes the ...

Page 81: ...imits on the Tire and Loading Information label See Vehicle Load Limits in the owner s manual Are driven on reasonable road surfaces within legal driving limits Use the recommended fuel See Fuel for Diesel Engines 0 30 Refer to the information in the Maintenance Schedule Additional Required Services Normal chart The Additional Required Services Severe are for vehicles that are Mainly driven in hea...

Page 82: ...reset accidentally service the vehicle within 5 000 km 3 000 mi since the last service Reset the oil life system when the oil is changed See Engine Oil Life System 0 66 Engine Air Filter Change When the REPLACE AT NEXT OIL CHANGE message displays the engine air filter should be replaced at the next engine oil change When the REPLACE ENGINE AIR FILTER SOON message displays the engine air filter sho...

Page 83: ...ne air filter life system See Engine Air Filter Life System 0 66 If the vehicle is not equipped with the engine air filter life system inspect the engine air cleaner filter See Engine Air Cleaner Filter 0 67 Check engine coolant level See Cooling System Engine 0 69 or Cooling System Low Temperature Cooling Circuit 0 72 Visually check for fluid leaks Visually inspect fuel system for damage or leaks...

Page 84: ...ed Check engine air filter life per centage and status Change engine air filter if needed If the vehicle is not equipped with the engine air filter life system replace engine air cleaner filter 1 Drain and fill engine cooling system 2 Visually inspect accessory drive belts 3 Replace fuel filter 4 Footnotes Maintenance Schedule Additional Required Services Normal 1 Or every four years whichever com...

Page 85: ... per centage and status Change engine air filter if needed If the vehicle is not equipped with the engine air filter life system 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 fuel filter 4 Footnotes Maintenance Schedule Additional Required Services Severe 1 Or every four yea...

Page 86: ...t Aftertreatment System Diesel Exhaust Fluid GM Part No 19286291 in Canada 88862660 or Diesel Exhaust Fluid that meets ISO 22241 or displays the API Diesel Exhaust Fluid Certification Mark Engine Coolant 50 50 mixture of clean drinkable water and use only DEX COOL coolant See Cooling System Engine 0 69 or Cooling System Low Temperature Cooling Circuit 0 72 Engine Oil Engine oils with the letters C...

Page 87: ... Maintenance Maintenance Replacement Parts Replacement 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 84554703 A3248C Fuel Filter 23304096 TP1015 Engine Oil Filter 12684038 PF26 Use only the specified filters ...

Page 88: ...4 17 19 Service and Maintenance 87 Maintenance Records After the scheduled services are performed record the date odometer reading who performed the service and the type of services performed in the boxes provided Retain all maintenance receipts Date Odometer Reading Serviced By Services Performed ...

Page 89: ...olet GMC 6 6L Duramax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 88 Technical Data Technical Data Vehicle Data Capacities and Specifications 89 Engine Drive Belt Routing 91 ...

Page 90: ...Temperature Cooling Circuit Cooling System 3 5 L 3 7 qt Diesel Exhaust Fluid DEF Tank 26 5 L 7 0 gal Engine Oil with Filter 9 5 L 10 0 qt Transfer Case Fluid 1500 Series 1 5 L 1 6 qt 2500 Series and 3500 Series 2 3 L 2 4 qt Hydraulic Power Steering Fluid 2 0 L 2 1 qt Engine cooling system capacity values are based on the entire cooling system and its components Do not overfill the DEF tank See Die...

Page 91: ...rolet GMC 6 6L Duramax Diesel Engine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 90 Technical Data Engine Specifications Engine VIN Code Type 6 6L 8 Cylinder Turbo Diesel L5P Engine Y V8 ...

Page 92: ...ine Supplement GMNA Localizing U S Canada 13337828 2020 CRC 4 17 19 Technical Data 91 Engine Drive Belt Routing 6 6L 8 Cylinder Engine Single Generator 6 6L 8 Cylinder Engine Dual Generator Fan Drive Belt Routing Secondary Auxiliary Drive ...

Page 93: ...tor 10 Cleaning Exterior Care 78 Cluster Instrument 6 Cold Weather Operation 32 Cooling System 69 72 Covers Winter 18 D Diesel Starting Your Engine 15 Diesel Exhaust Fluid 25 Diesel Exhaust Fluid DEF Warning Light 11 Diesel Particulate Filter 22 Drive Belt Routing Engine 91 Driver Information Center DIC 12 E Electrical System Engine Compartment Fuse Block 77 Engine Air Cleaner Filter 67 Check Ligh...

Page 94: ...ent Fuse Block 77 G General Information Service and Maintenance 79 H Heater Engine 21 I Instrument Cluster 6 Introduction 2 L Lamps Malfunction Indicator Check Engine 10 Lights Check Engine Malfunction Indicator 10 Diesel Exhaust Fluid DEF 11 Power Take off 12 Wait to Start 11 M Maintenance Records 87 Maintenance Schedule 81 Maintenance Schedule cont d Recommended Fluids and Lubricants 85 Malfunct...

Page 95: ...Maintenance General Information 79 Specifications and Capacities 89 Starting the Diesel Engine 15 Supplement Using 2 System Engine Air Filter Life 66 T Top Tier Fuel 30 Towing Trailer 39 Trailer Towing 39 Transmission Fluid Automatic 66 U Using This Supplement 2 V Vehicle Canadian Owners 2 Vehicle cont d Personalization 13 W Wait to Start Light 11 Water in Fuel 33 Winter Cover 18 ...

Page 96: ...84458631 A C M Y CM MY CY CMY K 20_MUL_6 6L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458631A_2019APR11 ai 1 3 21 2019 11 06 49 AM 20_MUL_6 6L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458631A_2019APR11 ai 1 3 21 2019 11 06 49 AM ...

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