GMC SIERRA 2023 Owners Manual

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
410 OnStar
OnStar Additional
Information
In-Vehicle Audio Messages
Audio messages may play important
information at the following times:
.Prior to vehicle purchase. PressQto set
up an account.
.After change in ownership and at
90 days.
Transferring Service
PressQto request account transfer
eligibility information. The Advisor can
cancel or change account information.
Selling/Transferring the Vehicle
Call 1-888-4ONSTAR (1-888-466-7827)
immediately to terminate your OnStar or
connected services if the vehicle is disposed
of, sold, transferred, or if the lease ends.
Reactivation for Subsequent Owners
PressQand follow the prompts to speak to
an Advisor as soon as possible. The Advisor
will update vehicle records and explain
OnStar or connected service options.
How OnStar Service Works
Automatic Crash Response, Emergency
Services, Crisis Assist, Stolen Vehicle
Assistance, Remote Services, and Roadside
Assistance are available on most vehicles.
Not all OnStar services are available
everywhere or on all vehicles. For more
information, a full description of OnStar
services, system limitations, and OnStar User
Terms, Privacy Statement, and Software
Terms:
.Call 1-888-4ONSTAR (1-888-466-7827).
.See www.onstar.com (U.S.).
.See www.onstar.ca (Canada).
.Call TTY 1-877-248-2080.
.PressQto speak with an Advisor.
OnStar or connected services cannot work
unless the vehicle is in a place where OnStar
has an agreement with a wireless service
provider for service in that area. The
wireless service provider must also have
coverage, network capacity, reception, and
technology compatible with OnStar or
connected services. Service involving location
information about the vehicle cannot work
unless GPS signals are available,
unobstructed, and compatible with the
OnStar hardware. OnStar or connected services may not work if the OnStar
equipment is not properly installed or it has
not been properly maintained. If equipment
or software is added, connected,
or modified, OnStar or connected services
may not work. Other problems beyond the
control of OnStar
—such as hills, tall
buildings, tunnels, weather, electrical system
design and architecture of the vehicle,
damage to the vehicle in a crash, or wireless
phone network congestion or jamming —
may prevent service.
See Radio Frequency Statement 0404.
Services for People with Disabilities
Advisors provide services to help with
physical disabilities and medical conditions.
Press
Qto help:
.Locate a gas station with an attendant to
pump gas.
.Find a hotel, restaurant, etc., that meets
accessibility needs.
.Provide directions to the closest hospital
or pharmacy in urgent situations.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
OnStar 411
TTY Users
OnStar has the ability to communicate to
deaf, hard-of-hearing, or speech-impaired
customers while in the vehicle. The available
TTY system can provide in-vehicle access to
all OnStar services, except Virtual Advisor
and OnStar Turn-by-Turn Navigation.
If equipped, TTY mode can be turned on or
off by touching Settings, then Apps, and
then Phone. When TTY mode is on, phone
calls can be made or received with OnStar
using the infotainment display.
OnStar Personal Identification
Number (PIN)
A PIN is needed to access some OnStar
services. The PIN will need to be changed
the first time when speaking with an
Advisor. To change the OnStar PIN, contact
an OnStar Advisor by pressing
Qor calling
1-888-4ONSTAR.
Warranty
OnStar equipment may be warranted as part
of the vehicle warranty.
Languages
The vehicle can be programmed to respond
in multiple languages. Press
Qand ask for
an Advisor. Advisors are available in English,
Spanish, and French. Available languages
may vary by country.
Potential Issues
OnStar cannot perform Remote Door Unlock
or Stolen Vehicle Assistance after the vehicle
has been off continuously for an extended
period of time without an ignition cycle. To
find out the duration of time that applies
for the vehicle, contact an OnStar Advisor by
pressing
Qor calling 1-888-4ONSTAR. If the
vehicle has not been started for an extended
period of time, OnStar can contact Roadside
Assistance or a locksmith to help gain access
to the vehicle.
Global Positioning System (GPS)
.Obstruction of the GPS can occur in a
large city with tall buildings; in parking
garages; around airports; in tunnels and
underpasses; or in an area with very
dense trees. If GPS signals are not
available, the OnStar system should still operate to call OnStar. However, OnStar
could have difficulty identifying the exact
location.
.In emergency situations, OnStar can use
the last stored GPS location to send to
emergency responders.
A temporary loss of GPS can cause loss of
the ability to send a Turn-by-Turn
Navigation route. The Advisor may give a
verbal route or may ask for a call back after
the vehicle is driven into an open area.
Cellular and GPS Antennas
Cellular reception is required for OnStar to
send remote signals to the vehicle. Do not
place items over or near the antenna to
prevent blocking cellular and GPS signal
reception.
Unable to Connect to OnStar Message
If there is limited cellular coverage or the
cellular network has reached maximum
capacity, this message may come on. Press
Qto try the call again or try again after
driving a few miles into another
cellular area.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
412 OnStar
Vehicle and Power Issues
OnStar services require a vehicle electrical
system, wireless service, and GPS satellite
technologies to be available and operating
for features to function properly. These
systems may not operate if the battery is
discharged or disconnected.
Add-on Electrical Equipment
The OnStar system is integrated into the
electrical architecture of the vehicle. Do not
add any electrical equipment. SeeAdd-On
Electrical Equipment 0297. Added electrical
equipment may interfere with the operation
of the OnStar system and cause it to not
operate.
Vehicle Software Updates
OnStar or GM may remotely deliver
software updates or changes to the vehicle
without further notice or consent. These
updates or changes may enhance or
maintain safety, security, or the operation
of the vehicle or the vehicle systems.
Software updates or changes may affect or
erase data or settings that are stored in the
vehicle, such as saved navigation
destinations or pre-set radio stations.
Neither OnStar nor GM is responsible for
any affected or erased data or settings. These updates or changes may also collect
personal information. Such collection is
described in the OnStar privacy statement or
separately disclosed at the time of
installation. These updates or changes may
also cause a system to automatically
communicate with GM servers to collect
information about vehicle system status,
identify whether updates or changes are
available, or deliver updates or changes. An
active OnStar agreement constitutes consent
to these software updates or changes and
agreement that either OnStar or GM may
remotely deliver them to the vehicle.
Privacy
The complete OnStar Privacy Statement may
be found at www.onstar.com (U.S.),
or www.onstar.ca (Canada). We recommend
that you review it. If you have any
questions, call 1-888-4ONSTAR
(1-888-466-7827) or press
Qto speak with
an Advisor. Users of wireless
communications are cautioned that the
privacy of any information sent via wireless
cellular communications cannot be assured.
Third parties may unlawfully intercept or
access transmissions and private
communications without consent.
OnStar - Software Acknowledgements
To obtain the source code under GPL, LGPL,
MPL, and other open source licenses, that is
contained in this product, please visit
https://opensource.lge.com. In addition to
the source code, all referred license terms,
warranty disclaimers, and copyright notices
are available for download. This offer is valid
for a period of three years after our last
shipment of this product. This offer is valid
to anyone in receipt of this information.
*Provided through LG Electronics Inc., who is
solely responsible for provisions of related
OSS compliance.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Connected Services 413
Connected Services
Connected Services
Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Connected Services
Navigation
Navigation requires a specific OnStar or
connected service plan.
Press
Qto receive Turn-by-Turn directions
or have them sent to the vehicle’s
navigation screen, if equipped. Select
Turn-by-Turn Directions from the Services
tab of the OnStar app to call an Advisor or
select a recent or favorite destination. Touch
the navigation icons to select home, address,
or place. A destination transfer from OnStar
will show the detail view of the destination
when it is transferred from OnStar to the
Navigation application. See www.onstar.com
for a coverage map. Services vary by model.
Map coverage is available in the United
States and Canada.
Turn-by-Turn Navigation
1. PressQto connect to an Advisor.
2. Request directions to be downloaded to the vehicle.
3. Follow the voice-guided commands.
Using Voice Commands During a
Planned Route
Functionality of the Voice Command button,
if equipped, may vary by vehicle and region.
For some vehicles, press
=to open the
OnStar app on the infotainment display.
Send Destination to Vehicle
Directions can be sent to the vehicle’s
navigation screen, if equipped.
Press
Q, then ask the Advisor to download
directions to the vehicle’s navigation system,
if equipped. After the call ends, the
navigation screen will provide prompts to
begin driving directions. Routes that are sent
to the navigation screen can only be
canceled through the navigation system.
See www.onstar.com (U.S.) or www.onstar.ca
(Canada).
Connections
The following services help with staying
connected.
For coverage maps, see www.onstar.com
(U.S.) or www.onstar.ca (Canada).

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
414 Connected Services
Ensuring Security
.Change the default passwords for the
Wi-Fi hotspot and myGMC mobile
application. Make these passwords
different from each other and use a
combination of letters and numbers to
increase the security.
.Change the default name of the SSID
(Service Set Identifier). This is your
network’s name that is visible to other
wireless devices. Choose a unique name
and avoid family names or vehicle
descriptions.
Wi-Fi Hotspot (If Equipped)
The vehicle may have a built-in Wi-Fi
hotspot that provides access to the Internet
and web content at 4G LTE speed. Up to
seven mobile devices can be connected.
A data plan is required. Use the in-vehicle
controls only when it is safe to do so. 1. To retrieve Wi-Fi hotspot information, press
=to open the OnStar app on the
infotainment display, then select Wi-Fi
Hotspot. On some vehicles, touch Wi-Fi
or Wi-Fi Settings on the screen.
2. The Wi-Fi settings will display the Wi-Fi hotspot name (SSID), password, and on
some vehicles, the connection type (no Internet connection, 3G, 4G, 4G LTE), and
signal quality (poor, good, excellent). The
LTE icon shows connection to Wi-Fi. It is
possible that the icon may not illuminate
even though the vehicle has an active
connection.
3. To change the SSID or password, press
Qor call 1-888-4ONSTAR to connect
with an Advisor. On some vehicles, the
SSID and password can be changed in
the Wi-Fi Hotspot menu.
After initial set-up, your vehicle’s Wi-Fi
hotspot will connect automatically to your
mobile devices. Manage data usage by
turning Wi-Fi on or off on your mobile
device, using the myGMC mobile app, or by
contacting an OnStar Advisor. On some
vehicles, Wi-Fi can also be managed from
the Wi-Fi Hotspot menu.
MyGMC Mobile App (If Available)
Download the myGMC mobile app to
compatible Apple and Android smartphones.
GMC users can access the following services
from a smartphone:
.Remotely start/stop the vehicle,
if factory-equipped.
.Lock/unlock doors, if equipped with
automatic locks.
.Activate the horn and lamps.
.Check the vehicle’s fuel level, oil life,
or tire pressure, if factory-equipped with
the Tire Pressure Monitor System.
.Send destinations to the vehicle.
.Locate the vehicle on a map
(U.S. market only).
.Turn the vehicle's Wi-Fi hotspot on/off,
manage settings, and monitor data
consumption, if equipped.
.Locate a dealer and schedule service.
.Request Roadside Assistance.
.Set a parking reminder with pin drop,
take a photo, make a note, and set a
timer.
.Connect with GMC on social media.
Features are subject to change. For myGMC
mobile app information and compatibility,
see my.gmc.com.
An active OnStar or connected service plan
may be required. A compatible device,
factory-installed remote start, and power
locks are required. Data rates apply. See
www.onstar.com for details and system
limitations.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Connected Services 415
Remote Services
Contact an OnStar Advisor to unlock the
doors or sound the horn and flash the
lamps.
Marketplace
OnStar Advisors can provide offers from
restaurants and retailers on your route, help
locate hotels, or book a room. These services
vary by market.
Diagnostics
By monitoring and reporting on the vehicle's
key systems, OnStar Advanced Diagnostics,
if equipped, provides a way to keep up on
maintenance. Capabilities vary by model.
See www.onstar.com for details and system
limitations. Features are subject to change.
For updates on feature capabilities, see
my.gmc.com. Message and data rates may
apply.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
416 Index
IndexA
Accessories and Modifications . . . . . . . . . . . 302
Accessory Power . . . . . . . . . . . . . . . . . . . . . . . . . 227
Add-On Electrical Equipment . . . . . . . . . . . . . 297
Adding a Snow Plow or SimilarEquipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
Additional OnStar Information . . . . . . . . . . . . . . . . . . . . 410
Adjustments Lumbar, Front Seats . . . . . . . . . . . . . . . . . . . . 53
Agreements Trademarks and License . . . . . . . . . . . . . . . 189
Air Cleaner/Filter, Engine . . . . . . . . . . . . . . . . . . 310
Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Filter Life System . . . . . . . . . . . . . . . . . . . . . . 309
Filter, Passenger Compartment . . . . . . . . 201
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . 196
Airbag System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
How Does an Airbag Restrain? . . . . . . . . . . 69
Passenger Sensing System . . . . . . . . . . . . . . 70
What Makes an Airbag Inflate? . . . . . . . . . 68
What Will You See after an AirbagInflates? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
When Should an Airbag Inflate? . . . . . . . . 68
Where Are the Airbags? . . . . . . . . . . . . . . . . 67 Airbags
Adding Equipment to the Vehicle . . . . . . . 74
Passenger Status Indicator . . . . . . . . . . . . . . 119
Readiness Light . . . . . . . . . . . . . . . . . . . . . . . . . 119
Replacing System Parts after a
Crash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Servicing Airbag-Equipped Vehicles . . . . . . 73
Alarm Vehicle Security . . . . . . . . . . . . . . . . . . . . . . . . 34
Alert Lane Change . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Rear Cross Traffic . . . . . . . . . . . . . . . . . . . . . . 257
Side Blind Zone (SBZA) . . . . . . . . . . . . . . . . . 260
All-Season Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 338
All-Terrain Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 338
AM-FM Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . .154
Antenna Fixed Mast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Multi-band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Antilock Brake System (ABS) . . . . . . . . . . . . . 238 Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . 123
Appearance Care Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
Apple CarPlay and Android Auto . . . . . . . . . . 181
Assistance Program, Roadside . . . . . . . . . . . . 399
Assistance Systems
Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Index 417
Assistance Systems (cont'd)Parking and Backing . . . . . . . . . . . . . . . . . . . 248
Audio Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Automatic Dimming Mirrors . . . . . . . . . . . . . . . . . . . . . . . 39
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Emergency Braking (AEB) . . . . . . . . . . . . . . 259
Headlamp System . . . . . . . . . . . . . . . . . . . . . . 141
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Transmission Fluid . . . . . . . . . . . . . . . . . . . . . 309
Transmission Shift Lock ControlFunction Check . . . . . . . . . . . . . . . . . . . . . . . 322
Automatic Transmission Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . 232
Auxiliary
Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Roof Mounted Lamp . . . . . . . . . . . . . . . . . . . 144
Avoiding Untrusted Media Devices . . . . . . . .158
Axle Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
B
BatteryExterior Lighting Battery Saver . . . . . . . . 147
Load Management . . . . . . . . . . . . . . . . . . . . . 147 Battery (cont'd)
Power Protection . . . . . . . . . . . . . . . . . . . . . . 147
Battery - North America . . . . . . . . . . . . .319, 367
Blade Replacement, Wiper . . . . . . . . . . . . . . . 323
Blind Spot Mirrors . . . . . . . . . . . . . . . . . . . . . . . . 39
Bluetooth Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 176, 177
Brake Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
Pad Life System . . . . . . . . . . . . . . . . . . . . . . . . 317
System Warning Light . . . . . . . . . . . . . . . . . 122
Brake Pad Life System . . . . . . . . . . . . . . . . . . . . 317
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317 Antilock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Brake Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
Electric Parking Brake . . . . . . . . . . . . . . . . . . 239
Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 Automatic Emergency (AEB) . . . . . . . . . . . 259
Break-In, New Vehicle . . . . . . . . . . . . . . . . . . . . . 221
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . . . 325 Center High-Mounted Stoplamp(CHMSL) and Cargo Lamp . . . . . . . . . . . . 327
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . 325
Headlamp Aiming . . . . . . . . . . . . . . . . . . . . . . 325
Headlamps, Front Turn Signal, Sidemarker, and Parking Lamps . . . . . . 325
License Plate Lamps . . . . . . . . . . . . . . . . . . . 327 Bulb Replacement (cont'd)
Taillamps, Turn Signal, Stoplamps,
and Back-up Lamps . . . . . . . . . . . . . . . . . . 326
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . . . 352
C
Calibration Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
California Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . . . . . . . . . . 302
California Proposition 65 Warning . . . . . 1, 367
Camera
Rear Vision (RVC) . . . . . . . . . . . . . . . . . . . . . . 248
Truck Bed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Canadian Vehicle Owners . . . . . . . . . . . . . . . . . . .2
Capacities and Specifications . . . . . . . . . . . . . 393
Carbon Monoxide Engine Exhaust . . . . . . . . . . . . . . . . . . . . . . . . 229
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . . 212
Cargo
Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Caution, Danger, and Warning . . . . . . . . . . . . . .2
Center High-Mounted Stoplamp (CHMSL)
and Cargo Lamp . . . . . . . . . . . . . . . . . . . . . 327
Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
418 Index
Center ConsoleStorage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Chains, Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
Charging System Light . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Wireless . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Check Engine Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Child Restraints Infants and Young Children . . . . . . . . . . . . . 77
Lower Anchors and Tethers forChildren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Older Children . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Securing . . . . . . . . . . . . . . . . . . . . . . . . 92, 96, 99
Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Child Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . .25
Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Cleaning
Exterior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Interior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
Climate Control Systems . . . . . . . . . . . . . . . . . 196
Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . 196
Dual Automatic . . . . . . . . . . . . . . . . . . . . . . . . 197
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Cluster, Instrument . . . . . . . . . . . . . . . . . . . . . . . 111
Collision Damage Repair . . . . . . . . . . . . . . . . . 402 Compartments
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Connected Services Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Connections Connected Services . . . . . . . . . . . . . . . . . . . . 413
Control Hill Descent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Traction and Electronic Stability . . . . . . . 241
Control Light Hill Descent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Control of a Vehicle . . . . . . . . . . . . . . . . . . . . . 205
Controls Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . . 151
Convex Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Coolant Engine Temperature Gauge . . . . . . . . . . . . . 117
Engine Temperature Warning Light . . . . 125
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196, 197
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Courtesy Transportation Program . . . . . . . . 401
Coverage Explanations . . . . . . . . . . . . . . . . . . . . 171
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 244 Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Cupholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Customer Assistance
Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 398
Text Telephone (TTY) Users . . . . . . . . . . . . 398
Customer Information Publications Ordering Information . . . . . 404
Customer Satisfaction Procedure . . . . . . . . . 396
Cybersecurity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406
D
Damage Repair, Collision . . . . . . . . . . . . . . . . . 402
Danger, Warning, and Caution . . . . . . . . . . . . . .2
Dashboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Data Collection Infotainment System . . . . . . . . . . . . . . . . . . 407
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407
Data Recorders, Event . . . . . . . . . . . . . . . . . . . 406
Database Coverage Explanations . . . . . . . . . . 171
Daytime Running Lamps (DRL) . . . . . . . . . . . . 141
Defensive Driving . . . . . . . . . . . . . . . . . . . . . . . . 205
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Destination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Diagnostics Connected Services . . . . . . . . . . . . . . . . . . . . 415
Disabled Vehicle Transporting . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
Distracted Driving . . . . . . . . . . . . . . . . . . . . . . . . 204
Dome Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Index 419
DoorAjar Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . 24
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Drive Belt Routing, Engine . . . . . . . . . . . . . . . 395
Drive Systems Four-Wheel Drive . . . . . . . . . . . . . . . . . . . . . . 321
Driver Assistance Systems . . . . . . . . . . . . . . . . . . . . 246
Information Center (DIC) . . . . . . . . . . . 128, 130
Mode Control . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Mode Control Light . . . . . . . . . . . . . . . . . . . . 125
Teen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Driving Assistance Systems . . . . . . . . . . . . . . . . . . . . 257
Better Fuel Economy . . . . . . . . . . . . . . . . . . . 204
Characteristics and Towing Tips . . . . . . . . 268
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Distracted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Hill and Mountain Roads . . . . . . . . . . . . . . 212
If the Vehicle is Stuck . . . . . . . . . . . . . . . . . 214
Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . 207
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . 207
Vehicle Load Limits . . . . . . . . . . . . . . . . . . . . 215
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211 Driving (cont'd)
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
Dual Automatic Climate Control System . . . . 197
E
E85 or FlexFuel . . . . . . . . . . . . . . . . . . . . . . . . . . 264
ElectricParking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Parking Brake Light . . . . . . . . . . . . . . . . . . . . 122
Electrical Equipment, Add-On . . . . . . . . . . . . . . . . . . . . 297
System Overload . . . . . . . . . . . . . . . . . . . . . . 327
Electrical System Engine Compartment Fuse Block . . . . . . . 329
Fuses and Circuit Breakers . . . . . . . . . . . . . 329
Instrument Panel Fuse Block . . . . . . 333, 334
Electronic Stability Control (ESC) Off Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409
Engine
Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . 310
Air Filter Life System . . . . . . . . . . . . . . . . . . 309
Check Light (Malfunction Indicator) . . . . 120
Compartment Overview . . . . . . . . . . . . . . . . 305
Coolant Temperature Gauge . . . . . . . . . . . . 117
Coolant Temperature Warning Light . . . 125 Engine (cont'd)
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . 311
Drive Belt Routing . . . . . . . . . . . . . . . . . . . . . 395
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . 308
Oil Pressure Gauge . . . . . . . . . . . . . . . . . . . . . 116
Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . 126
Overheated Protection
Operating Mode . . . . . . . . . . . . . . . . . . . . . 315
Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
Power Messages . . . . . . . . . . . . . . . . . . . . . . . 135
Running While Parked . . . . . . . . . . . . . . . . . 230
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Equipment, Towing . . . . . . . . . . . . . . . . . . . . . . 276
Event Data Recorders . . . . . . . . . . . . . . . . . . . . 406
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Extended Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . .37
Extended Parking . . . . . . . . . . . . . . . . . . . . . . . . 229
Extender, Seat Belt . . . . . . . . . . . . . . . . . . . . . . . 64
Exterior
Cargo Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Lamp Controls . . . . . . . . . . . . . . . . . . . . . . . . . 139
Lamps Off Reminder . . . . . . . . . . . . . . . . . . . . 141
Lighting Battery Saver . . . . . . . . . . . . . . . . . 147