6.6L Duramax Diesel Engine Supplement - Chevrolet ...
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20_MUL_6.6L_Duramax_Diesel_Engline_Supplement__COV_en_US_84458631A_2019APR11.ai 1 3/21/2019 11:06:49 AM
C
M
Y
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6.6L Duramax Diesel
Engine Supplement
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K
84458631 AChevrolet/GMC 6.6L Duramax 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 . . . . . . . . . . . . . . . . . . . . . 92Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
2 Introduction
Introduction model variants, country Canadian Vehicle Owners
specifications, features/applications
The names, logos, emblems, that may not be available in your A French language manual can be
slogans, vehicle model names, and region, or changes subsequent to obtained from your dealer, at
vehicle body designs appearing in the printing of this owner’s manual. www.helminc.com, or from:
this manual including, but not limited Propriétaires Canadiens
Refer to the purchase
to, GM, the GM logo, CHEVROLET,
documentation relating to your On peut obtenir un exemplaire de
GMC, the CHEVROLET and GMC
specific vehicle to confirm the ce guide en français auprès du
Truck Emblems, SILVERADO,
features. concessionnaire ou à l'adresse
SIERRA, DENALI, and Duramax are
trademarks and/or service marks of This manual contains information suivante:
General Motors LLC, its that pertains to the operation of your Helm, Incorporated
subsidiaries, affiliates, or licensors. diesel engine. It also contains your Attention: Customer Service
Diesel Maintenance Schedule. The 47911 Halyard Drive
For vehicles first sold in Canada,
sections in this manual correspond Plymouth, MI 48170
substitute the name “General
to the sections in your owner’s USA
Motors of Canada Company” for
manual. This manual, along with
GMC and Chevrolet Motor Division
your owner’s manual, will assist you
wherever it appears in this manual.
in the proper use and maintenance
Using this Supplement
This manual describes features that of your vehicle. This supplement contains
may or may not be on the vehicle information specific to the unique
Keep this manual in the vehicle for
because of optional equipment that components of the vehicle. It does
quick reference.
was not purchased on the vehicle, not explain everything you need to
know about the vehicle. Read this
supplement along with the owner’s
manual to learn about the vehicle's
features and controls.
Litho in U.S.A.
©
Part No. 84458631 A First Printing 2019 General Motors LLC. All Rights Reserved.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-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.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
4 Introduction
2 NOTESChevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Instruments and Controls 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 . . . . . . . . 13Chevrolet/GMC 6.6L 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 SimilarChevrolet/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 SimilarChevrolet/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 SimilarChevrolet/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 SimilarChevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
10 Instruments and Controls
Malfunction Indicator Malfunctions are often indicated by
Caution (Continued)
the system before any problem is
Lamp (Check Engine noticeable. Being aware of the light
Light) and seeking service promptly when costly repairs not covered by the
it comes on may prevent damage. vehicle warranty. This could also
This light is part of the vehicle’s affect the vehicle’s ability to pass
emission control on-board an Emissions Inspection/
diagnostic system. If this light is on Caution
Maintenance test. See
while the engine is running, a
If the vehicle is driven continually Accessories and Modifications
malfunction has been detected and
with this light on, the emission 0 60.
the vehicle may require service. The
light should come on to show that it control system may not work as
is working when the ignition is on well, the fuel economy may be When the light is on, a malfunction
with the engine not running. See lower, and the vehicle may not has been detected. Diagnosis and
“Ignition Positions” in the owner’s run smoothly. This could lead to service may be required.
manual. costly repairs that might not be Poor fuel quality can cause
This light may also come on when covered by the vehicle warranty. inefficient engine operation and poor
the system has detected a problem driveability, which may go away
with the Diesel Exhaust Fluid (DEF) once the engine is warmed up.
management system. See Diesel Caution If this occurs, change the fuel brand.
Exhaust Fluid 0 25. It may require at least one full tank
Modifications to the engine, of the proper fuel to turn the light off.
transmission, exhaust, intake, See Fuel for Diesel Engines 0 30.
or fuel system, or the use of If the light remains on, see your
replacement tires that do not dealer.
meet the original tire
specifications, can cause this light
to come on. This could lead to
(Continued)Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Instruments and Controls 11
Emissions Inspection and . The light does not come on This light comes on briefly while
Maintenance Programs when the ignition is on with the starting the engine, as a check to
engine not running. show the light is working.
If the vehicle requires an Emissions
Inspection/Maintenance test, the . Critical emission control systems If the wait-to-start light comes on,
test equipment will likely connect to have not been completely the glow plug system is required
the vehicle's Data Link diagnosed. If this happens, the and operating. Wait until the light
Connector (DLC). vehicle would not be ready for turns off before starting the engine.
inspection and might require This light may not come on in warm
several days of routine driving temperatures.
before the system is ready for The fast warm-up glow plug system
inspection. This can happen if makes the wait-to-start light stay on
the 12-volt battery has recently for a shorter amount of time than
been replaced or run down, or if most diesel engines.
the vehicle has recently been
serviced. See Starting the Diesel Engine 0 15.
The DLC is under the instrument
See your dealer if the vehicle will
panel to the left of the steering
not pass or cannot be made ready Diesel Exhaust Fluid
wheel. Connecting devices that are
not used to perform an Emissions for the test. (DEF) Warning Light
Inspection/Maintenance test or to
service the vehicle may affect Wait-to-Start Light
vehicle operation. See “Add-On
Electrical Equipment” in the owner’s
manual. See your dealer if
assistance is needed.
The vehicle may not pass
This light, a Driver Information
inspection if:
Center (DIC) message, and a chime
. The light is on when the engine come on when there is an issue with
is running. the Diesel Exhaust Fluid.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
12 Instruments and Controls
If the DEF level has not been Information Displays to change the fuel filter on a
corrected, the light will continue to schedule consistent with your
flash when the vehicle is started. driving conditions.
The vehicle's speed may also be Driver Information
When the remaining fuel filter life is
limited. Center (DIC) low, the CHANGE FUEL FILTER
Also see Diesel Exhaust Fluid 0 25. The DIC is in the instrument cluster. message will appear on the display.
The DIC comes on when the ignition Change the fuel filter as soon as
Power Take-Off Light is on. possible.
A Duramax diesel vehicle may have Fuel Filter Life Reset : Reset the
the following additional DIC menu Fuel Filter Life Remaining display
items: after each fuel filter change. It will
not reset itself. Also, be careful not
DEF : Displays the Diesel Exhaust
to reset the display at any time other
Fluid (DEF) level as a bar graph
than when the fuel filter has just
with individual segments that
Chassis Cab been changed because it cannot be
illuminate from Empty (E) to Full (F).
reset accurately until the next fuel
The vehicle may have a Power When LOW appears on the display
filter change. The fuel filter life will
Take-Off (PTO) light. Under normal and the segments turn red, add
change to 100% when the system
operating conditions, the PTO light DEF as soon as possible. For a
has been reset. To reset the system,
will remain on throughout the PTO guide on how much DEF to add,
press and hold the thumbwheel for
operating cycle. If all conditions see Diesel Exhaust Fluid 0 25.
two seconds while Fuel Filter Life
required to engage PTO have not Fuel Filter Life Remaining : This Remaining is displayed on the DIC.
been met when enabling PTO, the display shows an estimate of the
PTO light will turn on, then turn off fuel filter's remaining useful life.
after one second. See Power If 90% Fuel Filter Life Remaining is
Take-Off (PTO) 0 41. displayed, it means 90% of the
current fuel filter life remains. The
fuel filter life system will alert whenChevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Instruments and Controls 13
Engine Air Filter Life : Displays an Vehicle 5. Touch z to go to the top level
estimate of the engine air filter’s of the Settings menu.
remaining useful life and the state of Personalization
the system. Engine Air Filter Life Climate and Air Quality
Use the audio system controls to
95% means 95% of the current air Select and the following may
access the personalization menus
filter life remains. Messages will display:
for customizing vehicle features.
display based on the engine air filter
life and the state of the system. The following features may be . Rapid Heat-Elevated Idle
When the REPLACE AT NEXT OIL available on some vehicles with a
Rapid Heat-Elevated Idle
CHANGE message displays, the diesel engine. See “Vehicle
engine air filter should be replaced Personalization” in the owner’s This allows the feature to be turned
at the time of the next oil change. manual for additional vehicle on and off. See “Elevated Idle” in
When the REPLACE SOON personalizations. Starting the Diesel Engine 0 15.
message displays, the engine air If equipped, these features may be Select Off or On.
filter should be replaced at the selected using the infotainment
earliest convenience. The Air Filter display.
Power Take-Off (PTO) (If
Life display must be reset after the Equipped)
engine air filter replacement. To To access the vehicle
personalization menu: There may be additional features
reset, see Engine Air Filter Life that can be customized for the PTO.
System 0 66. 1. Touch the Settings icon on the See Power Take-Off (PTO) 0 41.
Home Page of the infotainment See your dealer to enable these
display. features.
2. Touch Vehicle to display a list Select and the following may
of available options. display:
3. Touch to select the desired . Standby Speed
feature setting.
. Set 1 Speed
4. Touch 9 or R to turn a feature . Set 2 Speed
off or on.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
14 Instruments and Controls
. Tap Step Speed TAP STEP SPEED
. Shutdown Time This feature is available if the
vehicle is configured for stationary
STANDBY SPEED variable or mobile PTO, and allows
This feature allows for modifying the the selection of the PTO tap step
PTO Standby Speed. speed.
Select the desired setting. Select the desired PTO Tap
Step Speed setting.
SET 1 SPEED
This feature is available if the SHUTDOWN TIME
vehicle is configured for stationary This feature is available if the
preset PTO, and allows the vehicle is configured for stationary
selection of the PTO set 1 speed. preset or stationary variable PTO,
Select the desired PTO Standby Set and allows the selection of the PTO
1 setting. shutdown time.
Select the desired PTO Shutdown
SET 2 SPEED Time setting.
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.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 15
Driving and Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . . . 39
Starting and
Operating Operating
Trailer Towing
Trailer Towing . . . . . . . . . . . . . . . . . . 39
Starting the Diesel
Starting and Operating Conversions and Add-Ons Engine
Starting the Diesel Engine . . . . . 15 Power Take-Off (PTO) . . . . . . . . . 41
Winter Cover . . . . . . . . . . . . . . . . . . . 18 The diesel engine starts differently
Engine Heater . . . . . . . . . . . . . . . . . 21 than a gasoline engine.
Parking over Things
That Burn . . . . . . . . . . . . . . . . . . . . 22 Caution
Diesel Particulate Filter If the steering wheel is turned
Diesel Particulate Filter . . . . . . . . 22 until it reaches the end of its
Diesel Exhaust Fluid travel, and is held in that position
Diesel Exhaust Fluid . . . . . . . . . . . 25 while starting the vehicle, damage
may occur to the hydraulic power
Brakes steering system and there may be
Exhaust Brake . . . . . . . . . . . . . . . . . 29 loss of power steering assist.
Fuel
Top Tier Fuel . . . . . . . . . . . . . . . . . . 30 Move the shift lever to P (Park) or
Fuel Additives . . . . . . . . . . . . . . . . . 30 N (Neutral). To restart the engine
Fuel for Diesel Engines . . . . . . . . 30 when the vehicle is already moving,
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . 31 use N (Neutral) only.
Cold Weather Operation . . . . . . . 32
Water in Fuel . . . . . . . . . . . . . . . . . . 33
Running Out of Fuel . . . . . . . . . . . 36
Fuel Filter Replacement . . . . . . . 36
Filling the Tank . . . . . . . . . . . . . . . . 37Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
16 Driving and Operating
most diesel engines, due to the For turbo protection, engine power
Caution rapid heating of the glow plug at speeds above idle may be limited
system. if the engine is cold. This protection
Do not try to shift to P (Park) if the can last up to 40 seconds at
vehicle is moving. If you do, you extreme cold coolant and ambient
could damage the transmission. Caution
temperatures.
Shift to P (Park) only when the If the wait-to-start light stays on
vehicle is stopped. Cold Weather Starting
after starting the vehicle, the
vehicle may not run properly. Use the recommended engine oil
Starting the Engine Have the vehicle serviced when the outside temperature
right away. drops below freezing. See Engine
1. Turn the ignition key to Oil 0 63. When the outside
ON/RUN. temperature drops below –18 °C
3. If the engine does not start (0 °F), use of the engine coolant
Observe the wait-to-start light.
after 15 seconds of cranking, heater is recommended.
See Wait-to-Start Light 0 11.
turn the ignition off. Wait
This light may not come on if If you experience longer cranking
one minute for the cranking
the engine is warm. times, notice an unusual amount of
motor to cool, then try the
2. If the wait-to-start light is on, same steps again. exhaust smoke, or are at higher
wait until this light goes off. elevations (over 2 135 m or 7,000 ft),
If you are trying to start the engine you may use the engine coolant
Turn the ignition key to START,
after you have run out of fuel, follow heater. See Engine Heater 0 21.
then release the ignition key.
the steps in Running Out of Fuel
The engine will continue to See Fuel for Diesel Engines 0 30 for
0 36.
crank until the engine starts. information on what fuel to use in
When the engine is cold, let it run cold weather.
The engine has a fast warm-up
for a few minutes before driving.
glow plug system. The
This lets oil pressure build up. The If the Diesel Engine Will Not
wait-to-start light will illuminate
for a much shorter time than
engine will sound louder when it Start
is cold.
If the vehicle runs out of fuel, see
Running Out of Fuel 0 36.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 17
If the vehicle is not out of fuel, and Be sure you are using the proper and engine warmup. These speeds
the engine will not start: fuel for existing weather conditions. can range from approximately 600
Turn the ignition key to ON/RUN. See Fuel for Diesel Engines 0 30. to 1000 rpm.
After the wait-to-start light goes off, If the engine starts, runs a short Elevated Idle
turn the ignition key to START. time, then stops, the vehicle needs
service. The engine has a cold temperature
If the light does not go off, wait a high idle feature which elevates the
few seconds, then try starting the engine idle speed from base idle to
engine again. See your dealer as { Warning 1050 to 1100 rpm when outside
soon as you can for a starting temperatures are below 0 °C (32 °F),
system check. Do not use gasoline or starting
and the engine coolant temperature
aids, such as ether, in the air
If the light comes on and then goes is below 65 °C (150 °F). This feature
intake. They could damage the
off and you know the batteries are enhances heater performance by
engine, which may not be raising the engine coolant
charged, but the engine still will not
covered by the vehicle warranty. temperature faster.
start, the vehicle needs service.
They could also cause a fire,
If the light does not come on when which could cause serious To turn this feature on or off, see
the engine is cold, the vehicle personal injury. Vehicle Personalization 0 13.
needs service. When the engine is started, it will
If the batteries do not have enough slowly ramp up to the high idle
Engine Idle Variations speed after a delay of a few
charge to start the engine, see
“Battery” in the owner’s manual. Under certain conditions the engine seconds up to approximately
idle speed can vary or be elevated. two minutes. For this method to
Check that the correct engine oil Change in idle speed is normal and work properly there must be no
has been used and changed at does not indicate a problem. Normal throttle or brake pedal faults.
appropriate intervals. If the wrong oil conditions that can raise idle speed
is used, the engine may be harder The engine idle speed will return to
are low voltage, DPF regeneration,
to start. normal once the following conditions
air conditioning compressor loads,
are met:Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
18 Driving and Operating
. Engine coolant temperature Fast Idle control will be enabled . The vehicle speed is not
reaches 65 °C (150 °F). when the following conditions 0 km/h (0 mph).
. Air intake temperature reaches are met:
0 °C (32 °F). . The parking brake is set. Winter Cover
The high idle speed will be . The transmission is in P (Park) If equipped, the winter cover can be
temporarily interrupted and the or N (Neutral). used to enhance heater
engine speed will return to normal if performance in extremely cold
. The vehicle speed is about
any of the following conditions conditions below −4 °C (25 °F). The
0 km/h (0 mph). winter cover installs over the grille
occur:
. The cruise control Set switch is and restricts airflow to the engine
. The brake pedal is applied.
pressed and released for Preset compartment.
. The accelerator pedal is Fast Idle Speed (1200 rpm). For vehicles that did not come with
pressed. Fast Idle control will be disabled a winter cover, a GM winter cover
. The transmission is shifted out when one or more of the following can be purchased. See your dealer
of P (Park) or N (Neutral). conditions occur: for additional information.
. Vehicle speed is detected. . The cruise control Set switch is When the winter cover is in use, the
pressed and released. See heater, ventilation, and air
Once these inputs are removed, the
“Cruise Control” in the owner’s conditioning AUTO mode may not
engine idle speed will slowly ramp
manual. function properly. Use the manual
back up to high idle after the normal
. The cruise control Cancel switch settings for comfort.
delay, if the conditions for engine
coolant temperature and air intake is pressed. Usage Guidelines
temperature are still met. . The brake pedal is pressed. The winter cover should only be
Fast Idle Control . The transmission is shifted out used while operating the vehicle in
of P (Park) or N (Neutral). extremely cold temperatures or in
If equipped, this system can be
heavy snow for extended periods. In
used to increase the engine idle . The parking brake is released. these temperatures, the vehicle
speed.
does not need a large amount of airChevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 19
to properly cool the engine. When . Do not cover the opening in the ensure a tight fit. The initial
more airflow is required to cool the front bumper. installation of the cover is best
vehicle, the winter cover should not . Do not modify the cover. The performed when the winter cover
be used. The following usage winter cover does not cover is warm.
guidelines will allow adequate some sections of the front of the
airflow for proper radiator and air Installation (Chevrolet Pickup)
vehicle to provide enough
cooler performance: airflow.
. Do not use the winter cover if . When the winter cover is used,
towing a trailer in conditions the outside air temperature
above 10 °C (50 °F). The vehicle display may not function
may overheat if the radiator is properly.
covered while towing.
. Keep the underside of the winter
. Do not use the winter cover if a
cover as clean as possible.
snow plow is mounted on the Remove monthly or as
truck. necessary and clean away dust
and debris.
. Use only a mild soap to clean.
Do not use harsh soap, strong
detergents, or vinyl protectant/ 1. The white label must be at the
sealant type products as they top and back of the cover.
may damage the special finish.
Allow the winter cover to dry
completely before reinstalling.
Installation Instructions
When first trying to fit the cover, it
may appear to be undersized but
will stretch during installation toChevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
20 Driving and Operating
Installation (GMC Pickup)
1. The white label must be at the
top and back of the cover.
2. Starting in the middle, attach 3. To remove, reverse the steps
fastening points as illustrated. listed previously.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 21
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
“Engine Heater” in the owner’s
manual.
2. Starting in the middle, attach 3. To remove, reverse the steps
fastening points as illustrated. listed previously.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
22 Driving and Operating
Parking over Things Diesel Particulate Vehicles with the DPF have specific
fuel and engine oil requirements.
That Burn Filter See Fuel for Diesel Engines 0 30
and
{ Warning The exhaust system has a Diesel
Particulate Filter (DPF) to reduce
Engine Oil 0 63.
Things that can burn could touch vehicle emissions. On some
hot exhaust parts under the exhaust systems with a DPF, the Caution
vehicle and ignite. Do not park exhaust cooler mixes air with the
exhaust to lower the temperature Damage can occur to the DPF
over papers, leaves, dry grass, components if the required Ultra
or other things that can burn. before it leaves the tailpipe.
Low Sulfur Diesel (15 ppm sulfur
The DPF, the tailpipe, and other maximum) fuel and either CJ-4 or
exhaust system components must CK-4 engine oil are not used.
not be altered. Inspect regularly and This damage would not be
clean any mud or dirt from the
covered by the vehicle warranty.
exhaust cooler, especially where the
exhaust cooler connects to the
tailpipe and the openings where Under certain conditions, such as
fresh air enters the cooler. idling or very short trips, the
The DPF will clean itself as part of self-cleaning process has less
normal operation. Several factors efficiency and cannot be completed.
including fuel consumed, hours of To resolve this, continue driving
engine operation, and miles driven safely at a steady speed as close to
are monitored by the Engine Control the posted speed limit as possible,
Module (ECM). The self-cleaning preferably without stopping, until the
occurs approximately once per tank message turns off. This can take up
of fuel. to 30 minutes.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 23
If equipped with Power
{ Warning Caution (Continued) Take-Off (PTO), monitor the
instrument cluster for lights related
During DPF self-cleaning or for messages and take to the DPF.
during extended idling in P (Park), appropriate action. Continued
the exhaust system and exhaust idling with the warning light/ See Accessories and Modifications
gases are very hot. Things that message on could cause damage 0 60 if you are adding accessories
burn could touch hot exhaust to the DPF requiring repair and or modifying the vehicle.
parts under the vehicle and ignite. possible replacement that might Manual Regeneration of Diesel
You or others could be burned. not be covered by the vehicle Particulate Filter
Do not park, or idle for an warranty.
extended period of time, near or This feature is only available on
over papers, leaves, dry grass, Fleet and Commercial vehicles.
During self-cleaning there will be a
or other things that can burn. change in the exhaust sound and To verify that the vehicle has this
Keep the exhaust area clear of engine idle speed. Along with this, a feature, refer to the Vehicle Service
material that could ignite or burn. burning smell and reduction in fuel Parts Identification label (SPID) for
See Parking over Things That economy may be noticed. This is RPO code FPF or see
Burn 0 22. normal. www.gmupfitter.com to contact the
GM Upfitter Integration Group.
If the vehicle is idled or driven on
very short trips with the DPF If equipped, this feature allows for
warning message on and the manual cleaning/regeneration of the
Caution DPF when it is unable to clean
exhaust filter is not cleaned as
Avoid extended idling because required, the malfunction indicator itself. It may be necessary to
lamp and a DIC message will perform manual regeneration if
the DPF system is not capable of
display. See your dealer. Also see driving conditions — such as
self-cleaning at idle. During
Malfunction Indicator Lamp (Check extended slow speed, stop-and-go
extended idling, monitor the traffic, extended idling, short drive
instrument cluster lights and DIC Engine Light) 0 10.
cycles, or stationary PTO operation
(Continued) — prevent DPF self-cleaning.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
24 Driving and Operating
Manual regeneration can only be . The shift lever is in P (Park).
used when the DPF has become at { Warning . The fuel tank is at least
least 90% full. At 100% full, it will one-eighth full.
attempt to automatically self-clean if Do not leave the vehicle during
proper driving conditions are met. the regeneration. . All fluids are at the proper level.
The DPF will clean itself if the Make sure that there are no . No diagnostic trouble codes
vehicle can be driven for about flammable materials near the have been set, and the
30 minutes. muffler, DPF, and exhaust pipe malfunction indicator lamp is
A DIC message displays when which may result in a fire. not on.
manual regeneration is possible. The temperature of exhaust . The engine coolant temperature
Scroll through the DIC pages to find gases is high enough to burn you. is above 71 °C (160 °F).
the Exhaust Cleaning menu. You and others could be seriously After making sure all safety
Depending on whether the vehicle injured. conditions have been met, press the
has a base or uplevel cluster, it may trip odometer reset stem or
be under the Settings menu. thumbwheel on the steering wheel
Before starting manual
If the vehicle cannot be stopped regeneration, make sure all of the for at least one second to select
when the DIC message first following safety conditions are met: Start on the infotainment display.
indicates cleaning is available, Follow the instructions in the DIC
. The vehicle is parked on level
automatic self-cleaning may have messages. Touch ACCEPT to
begun. If conditions cannot be met ground, away from any
flammable materials. acknowledge that all of these safety
for self-cleaning to complete, and conditions have been met and to
manual regeneration is selected, it . The vehicle is parked outdoors, activate regeneration.
may take up to four minutes for the away from any walls or
system to switch to manual buildings. If the infotainment display returns to
regeneration. When the switch the previous screen, then one or
. The vehicle is at least 3 m (10 ft) more of the necessary safety
occurs, a DIC message prompts to from any obstructions or
start the cleaning process. conditions has not been met. If you
materials that may combust cannot determine which condition
or melt.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 25
has not been met, see When manual regeneration begins, Diesel Exhaust Fluid
www.gmupfitter.com to contact the the engine speed increases, the
GM Upfitter Integration Group. engine cooling fan sound increases,
Continue to follow the instructions in and a DIC message indicates that { Warning
the DIC messages. Hold the cleaning is in progress.
Avoid getting Diesel Exhaust
exhaust brake switch on the center A DIC message will display when Fluid (DEF) on your skin or in
stack below the climate controls for cleaning is complete. Cleaning your eyes as it could cause
more than three seconds, and then could take up to 30 minutes. Upon irritation. For more safety,
release it, to begin the regeneration completion, the engine will return to handling, and storage information,
process. normal idle, but exhaust see the Diesel Exhaust Fluid
If the EXHAUST BRAKE ON components will remain hot for
container label.
message displays, then the switch several minutes. Do not move the
was released too soon. Press it vehicle until the exhaust has had
again to turn off the exhaust brake, time to cool. Manual regeneration
then try again when the DIC can be canceled at any time by Caution
message prompts. pressing the brake pedal or by
turning the engine off. Unusual Use only DEF that is GM
noises may be heard if regeneration approved, or fluid containing the
is interrupted. API certified or ISO 22241 label.
The use of other fluids could
damage the system, requiring
costly repairs that will not be
covered by the vehicle warranty.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
26 Driving and Operating
It is normal to hear the DEF system Filling the DEF Tank
Caution purge fluid back into the tank after
the vehicle is shut off.
Do not mix with or add DEF to the
diesel fuel. This could lead to Locating Diesel Exhaust Fluid
costly repairs not covered by the DEF can be purchased at your
vehicle warranty. authorized dealers. Additionally,
some diesel truck fueling stations or
Diesel Exhaust Fluid (DEF) is used retailers may have DEF for
with diesel engines to reduce the purchase. For vehicles with an
amount of regulated emissions active OnStar or connected services
produced. Products such as AdBlue plan, OnStar can help to locate a
are types of DEF. The fluid level in DEF retailer. See “Customer
the DEF tank must be maintained Assistance Offices” in the owner’s
for the vehicle to run properly. DEF manual for phone numbers to assist
in contacting a dealer. See The blue DEF cap is behind the
is not a fuel additive. DEF freezes fuel/DEF door. Do not remove the
when exposed to temperatures Recommended Fluids and
Lubricants 0 85. fuel and DEF caps at the same
below −11 °C (12 °F). For DEF tank time. Fill diesel fuel and DEF
capacity see Capacities and independently. Turn the DEF cap
Specifications 0 89. counterclockwise to remove.
In cold conditions DEF can freeze in
the DEF fill pipe opening. If this
prevents the filling of the DEF tank,
place the vehicle in a warm garage
overnight.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 27
always add at least 7.5 L (2 gal) of
fluid to release the vehicle from
speed limitation.
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,
as it could damage the vehicle
finish. If DEF is spilled during
filling, wipe any affected surface
with a damp cloth.
When replacing the DEF cap, turn it
Fill the DEF tank on level ground capacity see Capacities and clockwise until it clicks. Make sure
and with the vehicle off. When Specifications 0 89. When adding the cap is fully installed.
adding DEF, it is recommended to DEF to an empty or very low tank, Push the fuel/DEF door closed.
fully fill the DEF tank. For DEF tankChevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
28 Driving and Operating
DEF Low (300 mi) of remaining range before The speed limitation will occur in a
As the DEF level drops, warnings the exhaust fluid tank becomes series of steps with the final speed
will automatically be displayed in the empty. limitation being 8 km/h (5 mph)
Driver Information Center (DIC). As the fluid level nears empty, these along with a flashing warning light
Select Vehicle Information in the messages appear every time the and chimes.
DIC to view DEF level status. See vehicle is started. Adding fresh DEF to the system
Driver Information Center (DIC) If the DEF low warnings are ignored may resolve the problem after
0 12. and the DEF tank becomes empty, several kilometers/miles of driving,
Refill the DEF tank at the first the DIC will display messages that depending on several factors. If the
opportunity after a low warning describe the action needed and DIC message persists, see your
indication to avoid vehicle speed distance until vehicle speed is dealer or additional DIC messages
limitations. limited. For the DEF warning light may display.
It may take some time for the symbol, see Diesel Exhaust Fluid Service DEF System
vehicle to detect that DEF has been (DEF) Warning Light 0 11.
If a problem occurs with the DEF
added. If there was a vehicle speed DEF Quality Poor system, a DIC message displays
limitation, it will be removed along with distance until vehicle
gradually and it may take several Use only DEF that is GM approved,
or fluid containing the API certified speed is limited.
kilometers/miles for the DIC
message to update. or ISO 22241 label. The speed limitation will occur in a
DEF has an expiration date. If the series of steps with the final speed
If DEF is added under freezing limitation being 8 km/h (5 mph)
conditions, additional time may be system detects poor quality,
or contaminated or diluted DEF, a along with a flashing warning light
required to remove speed and chimes.
limitations. DIC message will display along with
distance until vehicle speed is In some cases, this message will
The DEF range DIC message first limited. clear itself, indicating that the DEF
displays at approximately 1 600 km system was able to correct the
(1,000 mi). This message appears condition. If the DIC message
again at approximately 500 kmChevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 29
persists, see your dealer or Brakes The exhaust brake only activates
additional DIC messages may when the transmission torque
display. converter is locked. This can vary
Exhaust Brake based on vehicle speed, gear,
Service Emission System and load.
The exhaust brake can be used to
If a problem occurs with the vehicle enhance the vehicle brake system To activate the system, press
emission system, a DIC message and reduce brake lining wear.
displays along with distance until EXHAUST BRAKE q on the center
vehicle speed is limited. The speed Downshifts may be automatically stack.
limitation will occur in a series of selected to increase engine speed,
which increases the effectiveness of A light in the switch will come on
steps with the final speed limitation when the exhaust brake is
of 88 km/h (55 mph) and chimes. In the exhaust brake. The number of
downshifts selected is determined activated. The switch must be
some cases, this message will clear pressed at each vehicle start for the
itself, indicating that the emission by the length of time the brakes are
applied and the rate the vehicle is system to be active.
system was able to correct the
condition. If the DIC message slowing. The system delivers the The Driver Information Center (DIC)
persists, see your dealer or correct amount of braking to assist displays the message EXHAUST
additional DIC messages may in vehicle control. The heavier the BRAKE ON for approximately
display. vehicle load, the more active the three seconds, then clears.
engine exhaust brake will be. Use of To turn the brake off, press the
the exhaust brake will help maintain exhaust brake switch a second time.
vehicle speed when used with The DIC displays the message
cruise control. See “Cruise Control” EXHAUST BRAKE OFF for
in the owner’s manual. approximately three seconds, then
Automatic downshifts will not occur clears.
if the vehicle is in Range Selection The exhaust brake will be more
Mode. See “Manual Mode” in the active when in Tow/Haul Mode.
owner’s manual.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
30 Driving and Operating
Fuel Fuel Additives Do not use a diesel blend containing
more than 20% biodiesel by volume.
TOP TIER Detergent Diesel is
Top Tier Fuel highly recommended for use with
your vehicle. If your area does not Caution
GM recommends the use of TOP
TIER Diesel Fuel to keep the engine have TOP TIER Detergent Diesel, Use of fuel that does not comply
clean, reduce engine deposits, and GM recommends the use of with the required technical
maintain optimal vehicle ACDelco Diesel Fuel Conditioner.
standards can lead to engine
performance. Look for the TOP This will help maintain optimal
power loss, increased wear,
TIER Logo or see engine performance. GM does not
recommend other aftermarket diesel or engine damage and may void
www.toptiergas.com for a list of TOP your warranty.
TIER Diesel Fuel marketers and additives.
applicable countries. If low-quality diesel is used for Some improper fuels are:
refueling, GM recommends adding . Diesel fuel with the addition
ACDelco Fuel System Treatment of gasoline.
Plus-Diesel to help clean engine . Diesel fuel mixed with
deposits. This is available only at
engine oil or automatic
your GM dealer.
transmission fluid.
Fuel for Diesel Engines . Triglyceride fuels, such as
raw vegetable oil or animal
The selection of a high-quality fuel fat, in any form, including
is important for maintaining optimum with blends of diesel or
vehicle performance. Diesel fuel biodiesel.
should meet or exceed the minimum
requirements in the most current . Marine diesel fuel and
versions of the local fuel standards. fuel oils.
Do not use fuel with more than 15 (Continued)
ppm sulfur.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 31
Some conditions, such as dirty fuel, conventional diesel fuel and
Caution (Continued) may decrease fuel filter life and a biodiesel blends, but may not
CHANGE FUEL FILTER message prevent all cases.
. Diesel-water emulsions, may come on in the Driver In case of severe winter conditions,
such as Aquazole. Information Center (DIC). the fuel filter may become clogged
. Aftermarket diesel fuel
Climate Grade Diesel Fuels by wax naturally present in the fuel.
additives, which contain To unclog it, move the vehicle to a
alcohols, organo-metallic At temperatures below 0 °C (32 °F), warm garage area and allow the
additives, or water avoid using biodiesel blends above filter to warm up. The fuel filter may
emulsifiers. 5% by volume. Using such a fuel need to be replaced. See Fuel Filter
may cause fuel filter plugging, Replacement 0 36.
system gelling, and freezing, which
may adversely impact vehicle
Caution starting.
Biodiesel
Biodiesel is a renewable fuel
If the vehicle is accidentally Severe winter grade diesel fuel,
such as 1-D diesel fuel or Arctic produced from vegetable oils or
refueled with gasoline, do not animal fats that have been
continue driving the vehicle. grade diesel fuel, can be used in
chemically modified to make it
Driving the vehicle will damage extreme cold temperatures (below
compatible with diesel fuel.
the fuel system. Have the vehicle −18 °C or 0 °F); however, doing so
towed to a qualified technician to will reduce power and fuel economy.
Avoid using severe winter grade fuel Caution
have the gasoline removed from
the tank and fuel system. Refuel in warm or hot climates. It can result
in stalling, poor starting, and Do not use home-made biodiesel
with Ultra Low Sulfur Diesel fuel. or home test kits because the
damage to the fuel injection system.
It is also recommended to have quality cannot be verified by
the fuel system flushed with Ultra Fuels improperly blended for cold approved scientific methods. Do
Low Sulfur Diesel, to ensure all temperature operation may result in not use raw vegetable oil or other
gasoline is removed. restricted fuel filters. The vehicle is
unmodified bio-oils, fats,
equipped with a fuel heating system
to prevent gelling or waxing of (Continued)Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
32 Driving and Operating
As a renewable fuel, biodiesel refueled with biodiesel-free fuel, and
Caution (Continued) provides some environmental driven several kilometers (miles)
benefits. However, biodiesel has before storage.
or blends of vegetable oil with unique properties and needs to be
diesel. They could damage the
fuel system and engine, and
handled differently than diesel fuel. Cold Weather Operation
Its use presents additional risks and
damages would not be covered may not be appropriate in all In cold weather, the fuel filter may
by the vehicle warranty. situations. Certain vehicle operating become clogged by wax naturally
modes increase these risks and present in the fuel. To unclog it,
should be avoided. move the vehicle to a warm garage
Biodiesel Blends area and allow the filter to warm up.
Fuels with a biodiesel content up to Biodiesel fuel quality degrades with The fuel filter may need to be
20% by volume may be used (e.g., time and exposure to high replaced. See Fuel Filter
named B20). Only use biodiesel temperature quicker than Ultra Low Replacement 0 36.
blends up to 20% by volume that Sulfur Diesel fuel. More frequent
refueling provides the best At temperatures below 0 °C (32 °F),
comply with your country’s or it is recommended to avoid using
region’s fuel standards. opportunity to have a supply of fresh
fuel. Storage at hot ambient biodiesel blends above 5% blend.
temperatures will accelerate This blend may cause fuel filter
Caution biodiesel degradation. plugging, system gelling, and
freezing that may affect vehicle
Do not use blends containing If the vehicle is not driven often and starting. You may need to turn the
more than 20% biodiesel. Any uses little fuel, or if it is stored for ignition on and off a few times
engine, fuel system, or exhaust extended periods of time, avoid the before the vehicle will start. Also,
after-treatment system damage use of biodiesel blended fuels idle the vehicle for a couple of
would not be covered by the above 5% by volume. When the minutes before accelerating.
vehicle warranty. vehicle is stored for longer than one
month, it should be run out of It is recommended to use Ultra Low
biodiesel to below one-quarter tank, Sulfur No. 1-D diesel fuel or a blend
of No. 1-D and No. 2-D diesel fuel to
enhance vehicle operation in coldChevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 33
weather at temperatures below 0 °C Water in Fuel Troubleshooting
(32 °F). Use of No. 1-D diesel fuel Caution
If the WATER IN FUEL SERVICE
may lower the fuel economy. For
Water in the diesel fuel can REQUIRED message comes on:
additional information for better cold
weather operation, see Engine corrode internal components of Recommended
Heater 0 21. the fuel system and lead to Problem Action
severe damage. It can also
support fungus or bacteria Message The fuel filter is
Water in Fuel displays but partially filled
growth, which can damage the
Improper fuel tank inspection or goes off during with water. Drain
fuel system. Even with a diesel the ignition the water as
cleaning, or contaminated fuel from fuel biocide, the fuel system may
suppliers, can cause water to be cycle. soon as
still need to be cleaned. Your possible. See
pumped into the fuel tank along with dealer can advise of the
the diesel fuel. If a WATER IN FUEL "Removing
appropriate solution. Water from the
SERVICE REQUIRED message
displays, the water must be drained If the fuel tank needs to be Fuel Filter"
immediately. purged to remove water, see your following.
dealer or a qualified technician.
{ Warning Improper purging can damage the
fuel system.
Diesel fuel containing water is still
combustible. You or others could
be burned. If the fuel needs to be
drained, keep sparks, flames, and
smoking materials away from the
mixture.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
34 Driving and Operating
Recommended Recommended Caution
Problem Action Problem Action
Message Drain the fuel Immediately A large amount Driving with this message on can
displays and filter after refueling, of water is in the damage the fuel injection system
stays on. immediately. message fuel tank. Drain and the engine. If the message
If no water can displays and the fuel filter comes on right after a refuel,
be drained, and stays on. immediately. water was pumped into the fuel
the temperature If the message tank. Turn off the engine and
is below stays on or drain the water immediately.
freezing, then comes back on
water may be without
frozen in the refueling, then Removing Water from the Fuel
filter. Move the fuel tank purging Filter
vehicle to a is required. See To drain water:
warm location to your dealer.
thaw the water, If the message 1. Turn the engine off and apply
then drain the displays and the the parking brake.
fuel. If water still engine stalls or
does not drain, runs rough, do
see your dealer. not drive until
the water
contaminated
fuel is drained.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 35
5. Start the engine and let it run Priming the Fuel System
for a few minutes. During the There is an electric priming pump
draining process, air may have that will bring fuel to the engine and
entered the fuel system. If the eliminate air in the fuel lines. To
engine stalls, the fuel system prime the engine:
may need to be primed. See
“Fuel Priming” following. 1. Correct any condition that
caused the loss of prime.
Fuel Priming
2. Turn the ignition on for
For the fuel system to work properly, 30 seconds. Do not start the
the fuel lines must be full of fuel. engine. The fuel pump will start
If air gets in, the fuel lines need to priming.
be primed before operating the
2. Place a container under the 3. Turn the ignition off, then back
vehicle.
filter drain valve. The filter drain on, and crank the engine for
valve is on the bottom of the If air is present, the following may 15 seconds.
fuel filter. The filter drain valve have happened:
4. If the engine does not start,
is under the vehicle on the . The vehicle ran out of fuel. repeat Steps 2 and 3 until the
driver side, inside the
. The fuel filter was removed. engine starts.
frame rail.
. The fuel lines were removed or If the engine does not start
3. Open the drain valve by turning
disconnected. after repeating Steps 2 and 3
it counterclockwise. Allow the
three times, turn the ignition off
filter to drain until all of the . The fuel filter water drain valve for 60 seconds.
water has been removed. was opened while the engine
Close the valve. was running. 5. Repeat the above steps until
the engine starts.
4. Properly dispose of the water
contaminated fuel. 6. If the engine starts, but does
not run smoothly, increase the
engine speed slightly.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
36 Driving and Operating
7. If the engine starts and runs Fuel Filter Replacement
but stalls again, turn the
ignition off for 60 seconds.
8. When the engine starts, let it
{ Warning
idle for a few minutes and Diesel fuel is flammable. It could
check the filter for any leaks. start a fire if something ignites it,
and people could be burned. Do
Running Out of Fuel not let it get on hot engine parts,
and keep matches or other
If the engine has stalled due to
running out of fuel, try to restart it: ignition sources away.
1. If parked on a level surface,
add at least 3.8 L (1 gal) of fuel. The fuel filter is on the driver side, 3. Remove the filter element cap
Up to 18.9 L (5 gal) may be inside the frame rail. by turning it counterclockwise.
needed if parked on a slope. To replace the fuel filter: 4. Remove the filter element.
2. Follow the vehicle fuel system 1. Drain any water from the filter. If there is any dirt on the filter
priming procedure earlier in See “Removing Water from the sealing surface, clean it off.
this section to re-prime the Fuel Filter” in Water in Fuel 5. Install the new filter element
system and restart the engine. 0 33. and o-ring.
If the malfunction indicator lamp Keep the engine off until the 6. Reinstall and tighten the filter
(check engine light) comes on due procedure is completed. cap to the housing.
to running out of fuel, it may take a
2. Apply the parking brake. 7. Use the fuel filter priming
few drive cycles to clear.
procedure to prime the fuel
filter. See “Fuel Priming” in
Water in Fuel 0 33.Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 37
8. Start the engine and let it idle
for five minutes. Check the fuel Warning (Continued) Warning (Continued)
filter and air bleed valve for
leaks. Follow these guidelines to help . Keep children away from
9. Reset the fuel filter monitor. avoid injuries to you and others: the fuel pump and never let
See Driver Information Center . Read and follow all the children pump fuel.
(DIC) 0 12. instructions on the fuel . Before touching the fill
pump island. nozzle, touch a metallic
Filling the Tank . Turn off the engine when object to discharge static
refueling. electricity from your body.
An arrow on the fuel gauge
indicates which side of the vehicle . . Fuel can spray out if the fuel
Keep sparks, flames, and
the fuel door is on. See “Fuel smoking materials away cap is opened too quickly.
Gauge” in the Owner’s Manual. Do from fuel. This spray can happen if the
not refill the diesel fuel and Diesel tank is nearly full, and is
Exhaust Fluid (DEF) at the . Do not leave the fuel pump more likely in hot weather.
same time. unattended. Open the fuel cap slowly
. Avoid using electronic and wait for any hiss noise
{ Warning devices while refueling. to stop, then unscrew the
cap all the way.
. Do not re-enter the vehicle
Fuel vapors and fuel fires burn
while pumping fuel.
violently and can cause injury or
death. (Continued)
(Continued)Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
38 Driving and Operating
Warning (Continued) { Warning
. Vehicle performance issues, If a fire starts while you are
including engine stalling and refueling, do not remove the fill
damage to the fuel system. nozzle. Shut off the flow of fuel by
. Fuel spills. shutting off the pump or by
notifying the station attendant.
. Under certain conditions, Leave the area immediately.
fuel fires.
Diesel fuel can foam when filling the
tank. The automatic pump nozzle Caution
Double Cab Shown, Crew Cab
may shut off, even if the tank is not
Similar If a new fuel cap is needed, be
full. Wait for the foaming to stop,
Turn the fuel cap counterclockwise and then fill the tank more slowly. sure to get the right type of cap
to remove. When refueling, hang the Be careful not to spill fuel. Wait from your dealer. The wrong type
fuel cap from the hook on the fuel five seconds after pumping before of fuel cap may not fit properly
door. Fully insert and latch the fill removing the fill nozzle. Clean fuel and could damage the fuel
nozzle, begin fueling. from painted surfaces as soon as system.
possible. See Exterior Care 0 78.
{ Warning Reinstall the cap by turning it
clockwise until it clicks. Push the
Overfilling the fuel tank by more fuel door closed.
than three clicks of a standard fill
nozzle may cause:
(Continued)Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 39
Accidental Refueling with Trailer Towing
Gasoline Warning (Continued)
When towing at high elevation on
means. You or others could be steep uphill grades, consider the
Caution badly burned and the vehicle following:
If the vehicle is accidentally could be damaged. Always:
Engine coolant at higher elevation
refueled with gasoline, do not . Use approved fuel will boil at a lower temperature than
continue driving the vehicle containers. at or near sea level. If the engine is
except to get to a location where . Remove the container from turned off immediately after towing
it can be stopped safely. Driving the vehicle, trunk, or pickup at high elevation on steep uphill
the vehicle will damage the bed before filling. grades, the vehicle may show signs
engine. Tow the vehicle for similar to engine overheating. To
. Place the container on the
service. Have the gasoline avoid this, let the engine run while
ground. parked (preferably on level ground)
removed from the tank and fuel
system. . Place the nozzle inside the with the transmission in P (Park)
fill opening of the container and the parking brake applied for at
before dispensing fuel, and least five minutes before turning the
Filling a Portable Fuel keep it in contact with the fill engine off. If the overheat warning
Container opening until filling is comes on, see Engine Overheating
complete. 0 74.
{ Warning . Fill the container no more Use the following chart to determine
the maximum the trailer can weigh,
than 95% full to allow for
Filling a portable fuel container expansion. based upon your vehicle model and
while it is in the vehicle can cause . Do not smoke, light options.
fuel vapors that can ignite either matches, or use lighters All axles of the trailer must be
by static electricity or other while pumping fuel. equipped with brakes adequate for
(Continued) . Do not use electronic the intended use. Trailer braking
equipment conforming to Canadian
devices while pumping fuel.You can also read
