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, GMC, the GMC Truck Emblem, SIERRA, and DENALI 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 Division wherever it appears 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.
If the vehicle has the Duramax diesel engine, see the Duramax diesel supplement for additional and specific information on this engine.
Refer to the purchase documentation relating to your specific vehicle to confirm the features.
Keep this manual in the vehicle for quick reference.
Litho in U.S.A.
Part No. 84550392 A First Printing © 2020 General Motors LLC. All Rights Reserved.
A French language manual can be obtained from your dealer, at www.helminc.com,
or from:
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
To quickly locate information about the vehicle, use the Index in the back of the manual. It is an alphabetical list of what is in the manual and the page number where it can be found.
Warning messages found on vehicle labels and in this manual describe hazards and what to do to avoid or reduce them.
A circle with a slash through it is a safety symbol which means "Do not," "Do not do this," or "Do not let this happen."
The vehicle has components and labels that use symbols instead of text. Symbols are shown along with the text describing the operation or information relating to a specific component, control, message, gauge, or indicator.
M : Shown when the owner’s manual has additional instructions or information.
* : Shown when the service manual has additional instructions or information.
0 : Shown when there is more information on another page — "see page."
Vehicle Symbol Chart
Here are some additional symbols that may be found on the vehicle and what they mean. See the features in this manual for information.
u : Air Conditioning System
G : Air Conditioning Refrigerant Oil
9 : Airbag Readiness Light
! : Antilock Brake System (ABS)
$ : Brake System Warning Light
9 : Dispose of Used Components Properly P : Do Not Apply High Pressure Water B : Engine Coolant Temperature
_ : Flame/Fire Prohibited
H : Flammable
[ : Forward Collision Alert
R : Fuse Block Cover Lock Location
+ : Fuses
j : ISOFIX/LATCH System Child Restraints
Q : Keep Fuse Block Covers Properly Installed
| : Lane Change Alert @ : Lane Departure Warning A : Lane Keep Assist
* : Malfunction Indicator Lamp
: : Oil Pressure
X : Park Assist
~ : Pedestrian Ahead Indicator
O : Power
7 : Rear Cross Traffic Alert
I : Registered Technician
/ : Remote Vehicle Start
> : Seat Belt Reminders
I : Side Blind Zone Alert
h : Stop/Start
7 : Tire Pressure Monitor
d : Traction Control/StabiliTrak/Electronic Stability Control (ESC)
a : Under Pressure
V : Vehicle Ahead Indicator
Driver Mode Control 0 249.
Automatic Transfer Case Control (If Equipped). See Four-Wheel Drive 0 241.
Driver Mode Control 0 249 (If Equipped).
Windshield Wiper/Washer 0 100.
0 237.
Range Selection Mode. See Manual Mode
0 240.
0 148.
Dual Automatic Climate Control System
0 205 (If Equipped).
(If Equipped).
X Park Assist Switch (If Equipped). See Assistance Systems for Parking or Backing 0 265.
h Auto Stop Disable Switch (If Equipped). See Stop/Start System 0 232.
5 Power Release Tailgate (If Equipped). See Tailgate 0 23.
| Hazard Warning Flashers 0 141.
Traction Control/Electronic Stability Control 0 247.
A DC/AC Switch. See Power Outlets
0 101.
5 Hill Descent Control Switch (If Equipped). See Hill Descent Control (HDC) 0 249.
j Power Assist Steps 0 30 (If Equipped).
L Express Window Down Button (If Equipped). See Power Windows 0 41.
Tow/Haul Mode 0 240 (On Some Models).
Exhaust Brake (If Equipped). See Duramax Diesel Supplement.
Power Take-Off (PTO) (If Equipped). See Duramax Diesel Supplement.
Driver Information Center (DIC) Controls. See Driver Information Center (DIC) (Base Level) 0 122 or
Driver Information Center (DIC) (Midlevel and Uplevel) 0 124.
19. Horn 0 100.
Adaptive Cruise Control (Camera) 0 255
(If Equipped).
Forward Collision Alert (FCA) System
0 273 (If Equipped).
Heated Steering Wheel 0 99 (If Equipped).
Instrument Panel Illumination Control
0 144.
Exterior Cargo Lamps 0 143.
Exterior Lamp Controls 0 138.
Task Lighting 0 143 (If Equipped).