2021 CHEVROLET COLORADO Duramax Diesel Supplement

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Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Instruments and Controls . . . . . . . . . . . . . . . . . 3
Driving and Operating . . . . . . . . . . . . . . . . . . . 13
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Service and Maintenance . . . . . . . . . . . . . . . . 72
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Introduction
The names, logos, emblems, slogans, vehicle
model names, and vehicle body designs
appearing in this manual including, but not
limited to, GM, the GM logo, CHEVROLET,
GMC, the CHEVROLET and GMC Truck
Emblems, COLORADO, CANYON, and
Duramax are trademarks and/or service
marks of General Motors LLC, its
subsidiaries, affiliates, or licensors.
For vehicles first sold in Canada, substitute
the name“General Motors of Canada
Company” for GMC and Chevrolet Motor
Division wherever they appear in this
manual.
This manual describes features that may or
may not be on the vehicle because of
optional equipment that was not purchased
on the vehicle, model variants, country
specifications, features/applications that may
not be available in your region, or changes
subsequent to the printing of this owner’s
manual.
Refer to the purchase documentation
relating to your specific vehicle to confirm
the features. This manual contains information that
pertains to the operation of the diesel
engine. It also contains the Diesel
Maintenance Schedule. The sections in this
manual correspond to the sections in the
owner’s manual. This manual, along with
the owner’s manual, will assist you in the
proper use and maintenance of the vehicle.
Keep this manual in the vehicle for quick
reference.
Canadian Vehicle Owners
A French language manual can be obtained
from your dealer, at www.helminc.com,
or from:
Propriétaires Canadiens
On peut obtenir un exemplaire de ce guide
en français auprès du concessionnaire ou à
l'adresse suivante:
Helm, Incorporated
Attention: Customer Service
47911 Halyard Drive
Plymouth, MI 48170
USA
Litho in U.S.A.
Part No. 84267010 A First Printing©2020 General Motors LLC. All Rights Reserved.

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
2 Introduction
Using this Supplement
This supplement contains information
specific to the unique components of the
vehicle. It does 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.
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 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Instruments and Controls 3
Instruments and Controls
Warning Lights, Gauges, and Indicators
Instrument Cluster . . . . . . . . . . . . . . . . . . . . . . . 4
Fuel Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Engine Oil Pressure Gauge . . . . . . . . . . . . . . . 8
Malfunction Indicator Lamp (Check EngineLight) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Wait-to-Start Light . . . . . . . . . . . . . . . . . . . . . . 10
Diesel Exhaust Fluid (DEF) Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power Take-Off Light (Chassis Cab Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Information Displays
Driver Information Center (DIC) . . . . . . . . . 10
Vehicle Personalization
Vehicle Personalization (Van Models) . . . . 11
Vehicle Personalization (PickupModels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
4 Instruments and Controls
Warning Lights, Gauges, and Indicators
Instrument Cluster
English Base Level 4-Cylinder Pickup Shown, Metric Similar

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Instruments and Controls 5
English Uplevel 4-Cylinder Pickup Shown, Metric Similar

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
6 Instruments and Controls
English Van Shown, Metric Similar

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Instruments and Controls 7
See the owner’s manual for warning lights
and gauges not listed in this supplement.
Fuel Gauge
Metric Base Level 4-Cylinder Pickup Shown,Uplevel Similar
English Base Level 4-Cylinder Pickup Shown, Uplevel Similar
Metric Van Models
English Van Models
When the ignition is on, the fuel gauge
shows approximately how much fuel the
vehicle has left in the tank. The gauge will
first indicate E (Empty) before the vehicle is
out of fuel, but the vehicle's fuel tank
should be filled soon.
An arrow on the fuel gauge indicates the
side of the vehicle the fuel door is on.
Listed are four situations customers may
experience with the fuel gauge:
.At the gas station, the fuel pump shuts
off before the gauge reads F (Full).
.It takes a little more or less fuel to fill up
than the fuel gauge indicated. For
example, the gauge may have indicated