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GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-15883563) - 2022 - CRC - 11/19/21
Driving and Operating 321
Trailer Brakes
Loaded trailers over 900 kg (2,000 lb) must
be equipped with brake systems and with
brakes for each axle. Trailer braking
equipment conforming to Canadian
Standards Association (CSA) requirement
CAN3-D313, or its equivalent, is
recommended.
State or local regulations may require
trailers to have their own braking system if
the loaded weight of the trailer exceeds
certain minimums that can vary from state
to state. Read and follow the instructions for
the trailer brakes so they are installed,
adjusted, and maintained properly.
{Warning
Never attempt to tamper with the
hydraulic brake system for your trailer
brakes. Do not connect a trailer's
hydraulic brake system directly to your
vehicle's hydraulic brake system. If you
do, both the vehicle antilock brakes and
the trailer brakes may not function,
which could result in a crash.
Auxiliary Battery
If equipped, the vehicle's auxiliary battery
can be used to supply electrical power to
additional equipment that may be added,
such as a slide-in camper.
Locate the auxiliary battery connector under
the hood on the driver side of the vehicle,
next to the engine compartment fuse block.
Follow the proper installation instructions
included with any electrical equipment that
is installed.
Caution
To prevent draining the auxiliary battery,
always turn off electrical equipment
when not in use and do not use any
equipment that may exceed the
maximum amperage rating of 30 amps.
Trailer Wiring Harness
Basic Trailer Wiring
If the vehicle is not equipped with a trailer
connector on the rear bumper, a 7-wire
trailering harness is tied to the vehicles
frame. The harness requires the installation
of a trailer connector, which is available
through your dealer.Use only a round, seven-wire connector with
flat blade terminals meeting SAE J2863
specifications for proper electrical
connectivity.
The seven-wire harness contains the
following trailer circuits:
Stop/Turn
Signal Left Yellow/Blue
Stop/Turn Signal
Right Green/Violet
Tail/Parking Lamps Gray/Brown
Reverse Lamps White/Green
Battery Feed Red/Green
Ground White
Electric Trailer Brake Blue
If equipped, the trailer wiring harness, with
a 7-pin connector and a 4-pin connector, is
mounted on the vehicle's rear bumper.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-15883563) - 2022 - CRC - 11/19/21
Driving and Operating 323
Camper/Fifth-Wheel Trailer Wiring Package
For vehicles without the fifth wheel/
gooseneck trailer package, the seven-wire
camper harness is under the rear bumper,
attached to the frame near the rear
crossmember. A connector must be added to
the wiring harness that connects to the
camper.
The harness contains the following camper/
trailer circuits:Stop/Turn
Signal Left Yellow/Blue
Stop/Turn Signal
Right Green/Violet
Tail/Parking Lamps Gray/Brown Reverse Lamps White/Green
Battery Feed Red/Green
Ground White
Electric Trailer Brake Blue
If equipped with the heavy-duty trailering
option, see “Heavy-Duty Trailer Wiring
Harness Package” earlier in this section.
When the camper-wiring harness is ordered
without the heavy-duty trailering package, a
seven-wire harness with a seven-pin
connector is at the rear of the vehicle and is
tied to the vehicle's frame.
Trailer Lamps
Always check that all trailer lamps are
working at the beginning of each trip, and
periodically on longer trips.
If equipped, the Trailering App will monitor
the RH turn/brake lamp circuit, LH turn/
brake lamp circuit, running lamp circuit, and
reverse lamp circuits on the trailer. DIC
messages and Trailering App alerts may be
displayed if lighting circuit issues are
detected on the trailer. Pressing START LIGHT TEST in the Trailering
App automatically activates the trailer
lamps. The Trailering App is not a substitute
for manually inspecting your trailer lamps.
See
Trailering App 0329.
Trailer Connection and Lamp Messages
When a trailer is properly connected and
working, no trailer connection or lamp
messages appear on the Driver Information
Center (DIC). However; if the vehicle detects
an issue with a trailer connection or lamp,
you may see the following DIC message(s):
.TRAILER DISCONNECTED CHECK
CONNECTION appears when a connected
trailer is disconnected. It appears
immediately when the vehicle is on,
or upon the next start-up if the trailer
was disconnected while the vehicle was
off. Check the trailer connection as
appropriate.
.CHECK TRAILER XXX LAMP appears when
there is a detected lamp or wiring fault
on the trailer. Check the trailer wiring and
lamps.
Turn Signals When Towing a Trailer
When properly connected, the trailer turn
signals will illuminate to indicate the vehicle
is turning, changing lanes, or stopping.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-15883563) - 2022 - CRC - 11/19/21
Customer Information 451
and notify General Motors of Canada
Company. Call Transport Canada at
1-800-333-0510; go to:
www.tc.gc.ca/recalls (English)
www.tc.gc.ca/rappels (French)
or write to:
Transport Canada
Motor Vehicle Safety Directorate
Defect Investigations and Recalls
Division
80 Noel Street
Gatineau
,QC J8Z 0A1
Reporting Safety Defects to
General Motors
In addition to notifying NHTSA (or Transport
Canada) in a situation like this, notify
General Motors.
In the U.S., call 1-800-462-8782, or write:
GMC Customer Assistance Center
P.O. Box 33172
Detroit, MI 48232-5172
In Canada, call 1-800-263-3777 (English) or
1-800-263-7854 (French), or write:General Motors of Canada Company
Customer Care Centre, Mail Code:
CA1-163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7
In Mexico, call 800-466-0812 or
800-466-0801.
In other Central America and Caribbean
Countries, call 52-555-901-2369.
Vehicle Data Recording and
Privacy
The vehicle has a number of computers that
record information about the vehicle’s
performance and how it is driven or used.
For example, the vehicle uses computer
modules to monitor and control engine and
transmission performance, to monitor the
conditions for airbag deployment and
deploy them in a crash, and, if equipped, to
provide antilock braking to help the driver
control the vehicle. These modules may
store data to help the dealer technician
service the vehicle or to help GM improve
safety or features. Some modules may also
store data about how the vehicle is
operated, such as rate of fuel consumptionor average speed. These modules may retain
personal preferences, such as radio presets,
seat positions, and temperature settings.
Cybersecurity
GM collects information about the use of
your vehicle including operational and safety
related information. We collect this
information to provide, evaluate, improve,
and troubleshoot our products and services
and to develop new products and services.
The protection of vehicle electronics systems
and customer data from unauthorized
outside electronic access or control is
important to GM. GM maintains appropriate
security standards, practices, guidelines and
controls aimed at defending the vehicle and
the vehicle service ecosystem against
unauthorized electronic access, detecting
possible malicious activity in related
networks, and responding to suspected
cybersecurity incidents in a timely,
coordinated and effective manner. Security
incidents could impact your safety or
compromise your private data. To minimize
security risks, please do not connect your
vehicle electronic systems to unauthorized
devices or connect your vehicle to any
unknown or untrusted networks (such as
Bluetooth, WIFI or similar technology). In

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-15883563) - 2022 - CRC - 11/19/21
OnStar 453
OnStar
OnStar Overview
OnStar Overview . . . . . . . . . . . . . . . . . . . . . . 453
OnStar Services
Emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454
OnStar Additional Information
OnStar Additional Information . . . . . . . . 454
OnStar Overview
=Voice Command Button
QBlue OnStar Button
>Red Emergency Button
This vehicle may be equipped with a
comprehensive, in-vehicle system that can
connect to an OnStar Advisor for Emergency,
Security, Navigation, Connections, and
Diagnostics Services. OnStar services may
require a paid service plan and data plan.
OnStar requires the vehicle battery and
electrical system, cellular service, and GPS
satellite signals to be available and
operating. OnStar acts as a link to existing
emergency service providers. OnStar may
collect information about you and your
vehicle, including location information. See
OnStar User Terms, Privacy Statement, and
Software Terms for more details including
system limitations at www.onstar.com (U.S.)
or www.onstar.ca (Canada). The OnStar system status light is next to
the OnStar buttons. If the status light is:
.Solid Green: System is ready.
.Flashing Green: On a call.
.Red: Indicates a problem.
.Off: System is off. PressQtwice to
speak with an OnStar Advisor.
Press
Qor call 1-888-4ONSTAR
(1-888-466-7827) to speak to an Advisor.
Functionality of the Voice Command button
may vary by vehicle and region.
Press
=to:
.Open the OnStar app on the infotainment
display. If equipped, the infotainment
system has OnStar controls in the
embedded OnStar app on the Home Page.
Most OnStar functions that can be
performed with the buttons can be done
using the app. To open the app, touch the
OnStar icon on the Home Page. App
updates require a corresponding service
plan. Features vary by region and model.
Features are subject to change. For more
information, see my.gmc.com/learn or
press
Q.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-15883563) - 2022 - CRC - 11/19/21
462 Index
Assistance Systems for Driving . . . . . . . . . . 293
Assistance Systems for Parking andBacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
Audio Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Auto Stop Stop/Start System . . . . . . . . . . . . . . . . . . . . . 225
Automatic Dimming Mirrors . . . . . . . . . . . . . . . . . . . . . . . 36
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Emergency Braking (AEB) . . . . . . . . . . . . . . 295
Headlamp System . . . . . . . . . . . . . . . . . . . . . 147
Transmission . . . . . . . . . . . . . . . . . . . . . . . 231, 233
Transmission Fluid . . . . . . . . . . . . . . . . . . . . . 350
Automatic Transmission Manual Mode . . . . . . . . . . . . . . . . . . . . 237, 239
Shift Lock Control Function Check . . . . . . 364
Auxiliary Roof Mounted Lamp . . . . . . . . . . . . . . . . . . . 150
Avoiding Untrusted Media Devices . . . . . . . 166
Axle Locking Front . . . . . . . . . . . . . . . . . . . . . . . . . . 253
Axle, Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
Axle, Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
B
Battery Exterior Lighting Battery Saver . . . . . . . . 154 Battery (cont'd)
Load Management . . . . . . . . . . . . . . . . . . . . . 154
Power Protection . . . . . . . . . . . . . . . . . . . . . . 154
Battery - North America . . . . . . . . . . . . 361, 407
Blade Replacement, Wiper . . . . . . . . . . . . . . . 364
Blind Spot Mirrors . . . . . . . . . . . . . . . . . . . . . . . . 36
Bluetooth Overview . . . . . . . . . . . . . . . . . . . . . 174, 175, 178
Bluetooth Audio . . . . . . . . . . . . . . . . . . . . . . . . . 168
Brake Electric Boost . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Parking, Electric . . . . . . . . . . . . . . . . . . . . . . . . 245
System Warning Light . . . . . . . . . . . . . . . . . . 121
Brake Pad Life System . . . . . . . . . . . . . . . . . . . 359
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358 Antilock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360
Pad Life System . . . . . . . . . . . . . . . . . . . . . . . 359
Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207 Automatic Emergency (AEB) . . . . . . . . . . . 295
Braking System Front Pedestrian (FPB) . . . . . . . . . . . . . . . . . 297
Break-In, New Vehicle . . . . . . . . . . . . . . . . . . . . 222
Buckle To Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Bulb Replacement Center High-Mounted Stoplamp(CHMSL) and Cargo Lamp . . . . . . . . . . . . 367 Bulb Replacement (cont'd)
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . 366
Headlamp Aiming . . . . . . . . . . . . . . . . . . . . . . 366
Headlamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
License Plate Lamps . . . . . . . . . . . . . . . . . . . 368
Taillamps, Turn Signal, Stoplamps,
and Back-up Lamps . . . . . . . . . . . . . . . . . . 367
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . . . 391
C
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
California Perchlorate Materials Requirements . . . 342
California Proposition 65 Warning . . . . . . . . . . . . . . . . . . . . . . . 361, 407, Back Cover
Camera
Rear Vision (RVC) . . . . . . . . . . . . . . . . . . . . . . 283
Canadian Vehicle Owners . . . . . . . . . . . . . . . . . . . 1
Capacities and Specifications . . . . . . . . . . . . . 439
Carbon Monoxide Engine Exhaust . . . . . . . . . . . . . . . . . . . . . . . . 230
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . . 213
Cargo Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Caution, Danger, and Warning . . . . . . . . . . . . . .2
Center Console Storage . . . . . . . . . . . . . . . . . . . 97

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-15883563) - 2022 - CRC - 11/19/21
468 Index
Navigation (cont'd)Destination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Using the System . . . . . . . . . . . . . . . . . . . . . . 169
Navigation Symbols . . . . . . . . . . . . . . . . . . . . . 170
New Vehicle Break-In . . . . . . . . . . . . . . . . . . . . 222
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348
Engine Oil Life System . . . . . . . . . . . . . . . . . 350
Engine Oil Pressure Gauge . . . . . . . . . . . . . . 114
Pressure Light . . . . . . . . . . . . . . . . . . . . . . . . . 126
Older Children, Restraints . . . . . . . . . . . . . . . . . .72
Online Owner Center . . . . . . . . . . . . . . . . . . . . 444
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452
OnStar Additional Information . . . . . . . . . . . 454
OnStar Emergency . . . . . . . . . . . . . . . . . . . . . . . 454
OnStar Overview . . . . . . . . . . . . . . . . . . . . . . . . . 453
OnStar Security . . . . . . . . . . . . . . . . . . . . . . . . . . 454
Operating Mode Overheated Engine Protection . . . . . . . . . 357
Operation Fog Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Outlets
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Overheated Engine Protection Operating Mode . . . . . . . . . . . . . . . . . . . . . . . 357
Overheating, Engine . . . . . . . . . . . . . . . . . . . . . 356
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156, 157 Instrument Panel . . . . . . . . . . . . . . . . . . . . . . . . 4
P
Park
Shifting Into . . . . . . . . . . . . . . . . . . . . . . 227, 228
Shifting Out of . . . . . . . . . . . . . . . . . . . . . . . . 229
Park Assist . . . . . . . . . . . . . . . . . . . . . . . . . . .283, 291
Parking Brake and P (Park) MechanismCheck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Over Things That Burn . . . . . . . . . . . . . . . . . 230
Parking or Backing Assistance Systems . . . . . . . . . . . . . . . . . . . . 283
Passenger Airbag Status Indicator . . . . . . . . . 118
Passenger Compartment Air Filter . . . . . . . 202
Passenger Sensing System . . . . . . . . . . . . . . . . 67
Pedestrian Ahead Indicator . . . . . . . . . . . . . . . 123
Perchlorate Materials Requirements, California . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
Personalization Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 Phone
Apple CarPlay and
Android Auto . . . . . . . . . . . . . . . . . . . . 182, 183
Bluetooth . . . . . . . . . . . . . . . . . . . . . 174, 175, 178
Pickup Conversion to Chassis Cab . . . . . . . . 340
Port USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Positioning Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Protection, Battery . . . . . . . . . . . . . . . . . . . . . 154
Retained Accessory (RAP) . . . . . . . . . . . . . . 227
Seat Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 47
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Power Assist Steps . . . . . . . . . . . . . . . . . . . . . . . . 30
Pregnancy, Using Seat Belts . . . . . . . . . . . . . . 60
Privacy Vehicle Data Recording . . . . . . . . . . . . . . . . 451
Problems with Route Guidance . . . . . . . . . . . 172
Program Courtesy Transportation . . . . . . . . . . . . . . . 447
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . . . . . . 305
Proposition 65 Warning,
California . . . . . . . . . . . . . . . . . . . . . . . . . 361, 407, Back Cover