ECU GMC SIERRA 2024 Manual PDF

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Customer Information 409
In the U.S., anyone driving the vehicle is
covered. In Canada, a person driving the
vehicle without permission from the owner
is not covered.
Roadside Assistance is not a part of the New
Vehicle Limited Warranty. General Motors
North America and GMC reserve the right to
make any changes or discontinue the
Roadside Assistance program at any time
without notification.
General Motors North America and GMC
reserve the right to limit services or
payment to an owner or driver if they
decide the claims are made too often, or the
same type of claim is made many times.
Services Provided
.Emergency Fuel Delivery:Delivery of
enough fuel for the vehicle to get to the
nearest service station.
.Lock-Out Service: Service to unlock the
vehicle if you are locked out. A remote
unlock may be available if you have
OnStar. For security reasons, the driver
must present identification before this
service is given.
.Emergency Tow from a Public Road or
Highway: Tow to the nearest GMC dealer
for warranty service, or if the vehicle was
in a crash and cannot be driven.
Assistance is not given when the vehicle
is stuck in the sand, mud, or snow.
.Flat Tire Change: Service to change a flat
tire with the spare tire. The spare tire,
if equipped, must be in good condition
and properly inflated. It is the owner's
responsibility for the repair or
replacement of the tire if it is not covered
by the warranty.
.Battery Jump Start: Service to jump start
a dead battery.
.Trip Interruption Benefits and Assistance:
If your trip is interrupted due to a
warranty event, incidental expenses may
be reimbursed within the Powertrain
warranty period. Items considered are
reasonable and customary hotel, meals,
rental car, or a vehicle being delivered
back to the customer, up to 500 miles.
Services Not Included in Roadside
Assistance
.Impound towing caused by violation of
any laws
.Legal fines
.Mounting, dismounting, or changing of
snow tires, chains, or other traction
devices
Service is not provided if a vehicle is in an
area that is not accessible to the service
vehicle or is not a regularly traveled or
maintained public road, which includes ice
and winter roads. Off-road use is not
covered.
Services Specific to Canadian-Purchased
Vehicles
.Fuel Delivery: Reimbursement is up to
7 liters. Diesel fuel delivery may be
restricted. Propane and other fuels are
not provided through this service.
.Lock-Out Service: Vehicle registration is
required.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Customer Information 415
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 consumption
or 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
the event you suspect any security incident
impacting your data or the safe operation of
your vehicle, please stop operating your
vehicle and contact your dealer.
Event Data Recorders
This vehicle is equipped with an Event Data
Recorder (EDR). The main purpose of an EDR
is to record, in certain crash or near
crash-like situations, such as an air bag
deployment or hitting a road obstacle, data
that will assist in understanding how a
vehicle’s systems performed. The EDR is
designed to record data related to vehicle
dynamics and safety systems for a short
period of time, typically 30 seconds or less.
The EDR in this vehicle is designed to record
such data as:
.How various systems in your vehicle were
operating;
.Whether or not the driver and passenger
safety belts were buckled/fastened;
.How far (if at all) the driver was
depressing the accelerator and/or brake
pedal; and,
.How fast the vehicle was traveling.
These data can help provide a better
understanding of the circumstances in which
crashes and injuries occur.
Note
EDR data are recorded by your vehicle only
if a non-trivial crash situation occurs; no
data are recorded by the EDR under normal

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
OnStar 417
OnStar
OnStar Overview
OnStar Overview . . . . . . . . . . . . . . . . . . . . . . 417
OnStar Services
Emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
OnStar Additional Information
OnStar Additional Information . . . . . . . . . 419
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 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
418 OnStar
Or
.Give OnStar Turn-by-Turn Navigation voice
commands.
.Obtain and customize the Wi-Fi hotspot
name or SSID and password, if equipped.
Press
Qto connect to an Advisor to:
.Verify account information or update
contact information.
.Get driving directions.
.Receive a Diagnostic check of the vehicle's
key operating systems.
.Receive Roadside Assistance.
.Manage Wi-Fi Settings, if equipped.
Press
>to get a priority connection to an
OnStar Advisor available 24/7 to:
.Get help for an emergency.
.Be a Good Samaritan or respond to an
AMBER Alert.
.Get assistance in severe weather or other
crisis situations and find evacuation
routes.
OnStar Services
Emergency
Emergency Services require an active safety
and security plan. With Automatic Crash
Response, built-in sensors can automatically
alert a specially trained OnStar Advisor who
is immediately connected in to the vehicle
to help.
Press
>for a priority connection to an
OnStar Advisor who can contact emergency
service providers, direct them to your exact
location, and relay important information.
With OnStar Crisis Assist, specially trained
Advisors are available 24 hours a day, 7 days
a week, to provide a central point of
contact, assistance, and information during a
crisis.
With Roadside Assistance, Advisors can
locate a nearby service provider to help with
a flat tire, a battery jump, or an empty
gas tank.
Security
If equipped, OnStar provides these services:
.With Stolen Vehicle Assistance, OnStar
Advisors can use GPS to pinpoint the
vehicle and help authorities quickly
recover it.
.With Remote Ignition Block, if equipped,
OnStar can block the vehicle from being
restarted.
.With Stolen Vehicle Slowdown,
if equipped, OnStar can work with law
enforcement to gradually slow the
vehicle down.
Theft Alarm Notification
If equipped, if the doors are locked and the
vehicle alarm sounds, a notification by text,
e-mail, or phone call will be sent. If the
vehicle is stolen, an OnStar Advisor can work
with authorities to recover the vehicle.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
OnStar 421
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 0306. 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-16908340) - 2024 - CRC - 12/7/22
Connected Services 423
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.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Index 425
IndexA
Accessories and Modifications . . . . . . . . . . . 310
Accessory Power . . . . . . . . . . . . . . . . . . . . . . . . . 220
AdaptiveCruise Control . . . . . . . . . . . . . . . . . . . . . . . . . 241
Add-On Electrical Equipment . . . . . . . . . . . . . 306
Adding a Snow Plow or Similar Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
Additional OnStar Information . . . . . . . . . . . . . . . . . . . . 419
Adjustments Lumbar, Front Seats . . . . . . . . . . . . . . . . . . . . 50
Advanced Driver Assistance Systems . . . . . . . . . . . . . 252
Agreements Trademarks and License . . . . . . . . . . . . . . . 188
Air Cleaner/Filter, Engine . . . . . . . . . . . . . . . . . . 318
Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Filter Life System . . . . . . . . . . . . . . . . . . . . . . . 317
Filter, Passenger Compartment . . . . . . . . 196
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Airbag System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
How Does an Airbag Restrain? . . . . . . . . . . 68
Passenger Sensing System . . . . . . . . . . . . . . 69
What Makes an Airbag Inflate? . . . . . . . . . 68 Airbag System (cont'd)
What Will You See after an Airbag
Inflates? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
When Should an Airbag Inflate? . . . . . . . . 67
Where Are the Airbags? . . . . . . . . . . . . . . . . 66
Airbags Adding Equipment to the Vehicle . . . . . . . 73
Passenger Status Indicator . . . . . . . . . . . . . . 121
Readiness Light . . . . . . . . . . . . . . . . . . . . . . . . . 121
Replacing System Parts after a
Crash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Servicing Airbag-Equipped Vehicles . . . . . . 73
Alarm Vehicle Security . . . . . . . . . . . . . . . . . . . . . . . . 32
Alert Lane Change (LCA) . . . . . . . . . . . . . . . . . . . . . 268
Rear Cross Traffic . . . . . . . . . . . . . . . . . . . . . . 263
All-Season Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 345
All-Terrain Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 346
AM-FM Radio . . . . . . . . . . . . . . . . . . . . . . . . 159, 161
Antenna Multi-band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Antilock Brake System (ABS) . . . . . . . . . . . . . 233 Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . 125
Appearance Care Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383
Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
Apple CarPlay and Android Auto . . . . . 177, 179

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Index 427
Canadian Vehicle Owners . . . . . . . . . . . . . . . . . . .2
Capacities and Specifications . . . . . . . . . . . . . 402
Carbon MonoxideEngine Exhaust . . . . . . . . . . . . . . . . . . . . . . . . 222
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . . 207
Cargo
Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Caution, Danger, and Warning . . . . . . . . . . . . . .2
Center High-Mounted Stoplamp (CHMSL)
and Cargo Lamp . . . . . . . . . . . . . . . . . . . . . 335
Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Center Console Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Chains, Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
Charging
System Light . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Wireless . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Check Engine Light (Malfunction Indicator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Child Restraints Infants and Young Children . . . . . . . . . . . . . 76
Lower Anchors and Tethers forChildren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Older Children . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Securing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92, 95
Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 Child Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . 24
Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . 337
Cleaning
Exterior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 383
Interior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
Climate Control Systems . . . . . . . . . . . . . . . . . . 191 Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . . 191
Dual Automatic . . . . . . . . . . . . . . . . . . . . . . . . 193
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Cluster, Instrument . . . . . . . . . . . . . . . . . . . 112, 113
Collision Alert Forward (FCA) System . . . . . . . . . . . . . . . . . 263
Collision Damage Repair . . . . . . . . . . . . . . . . . . 411
Compartments Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Connected Services Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
Connections Connected Services . . . . . . . . . . . . . . . . . . . . 422
Control Hill Descent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Traction and Electronic Stability . . . . . . . 236
Control Light Hill Descent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 Control of a Vehicle . . . . . . . . . . . . . . . . . . . . . 200
Controls
Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . 156
Convex Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Coolant Engine Temperature Gauge . . . . . . . . . . . . . 118
Engine Temperature Warning Light . . . . 128
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191, 193
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . 319
Courtesy Transportation Program . . . . . . . . 410
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 239 Adaptive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Cupholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Customer Assistance Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407
Text Telephone (TTY) Users . . . . . . . . . . . . 407
Customer Information Publications Ordering Information . . . . . 413
Customer Satisfaction Procedure . . . . . . . . . 405
Cybersecurity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .415
D
Damage Repair, Collision . . . . . . . . . . . . . . . . . . 411
Danger, Warning, and Caution . . . . . . . . . . . . . .2
Dashboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Data Collection Infotainment System . . . . . . . . . . . . . . . . . . 416

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Index 431
Lamps (cont'd)Exterior Lamps Off Reminder . . . . . . . . . . 145
Exterior Lighting Battery Saver . . . . . . . . 152
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Fog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
High/Low Beam Changer . . . . . . . . . . . . . . 145
License Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Malfunction Indicator (Check
Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
On Reminder . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Lane
Departure Warning Light . . . . . . . . . . . . . . 126
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . . . . . . . . 60
LATCH System Replacing Parts after a Crash . . . . . . . . . . . 91
LATCH, Lower Anchors and Tethers for Children . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
LED Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
Lighting Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Illumination Control . . . . . . . . . . . . . . . . . . . 150
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Lights
Airbag Readiness . . . . . . . . . . . . . . . . . . . . . . . 121
Antilock Brake System (ABS)
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Automatic Emergency Braking (AEB) Disabled . . . . . . . . . . . . . . . . . . . . . . . 126
Brake System Warning . . . . . . . . . . . . . . . . 124
Charging System . . . . . . . . . . . . . . . . . . . . . . 122
Check Engine (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Cruise Control Light . . . . . . . . . . . . . . . . . . . . . 131
Door Ajar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Driver Mode Control . . . . . . . . . . . . . . . . . . . 128
Electric Parking Brake . . . . . . . . . . . . . . . . . . 124
Electronic Stability Control (ESC), Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Engine Coolant Temperature Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Engine Oil Pressure . . . . . . . . . . . . . . . . . . . . 129
Four-Wheel-Drive . . . . . . . . . . . . . . . . . . . . . . 125
Front Fog Lamp . . . . . . . . . . . . . . . . . . . . . . . . 130
Gauges and Indicators . . . . . . . . . . . . . . . . . . 111
High-Beam On . . . . . . . . . . . . . . . . . . . . . . . . . 130
Hill Descent Control . . . . . . . . . . . . . . . . . . . 126
Lane Departure Warning . . . . . . . . . . . . . . . 126
Low Fuel Warning . . . . . . . . . . . . . . . . . . . . . 129
Seat Belt Reminders . . . . . . . . . . . . . . . . . . . 120
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 Lights (cont'd)
Service Electric Parking Brake . . . . . . . . . . 124
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Tow/Haul Mode . . . . . . . . . . . . . . . . . . . . . . . 125
Traction Control System
(TCS)/Electronic Stability Control
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Traction Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Lock Steering Column . . . . . . . . . . . . . . . . . . . . . . . . 33
Locking Rear Axle . . . . . . . . . . . . . . . . . . . . . . . . 239
Locks Automatic Door . . . . . . . . . . . . . . . . . . . . . . . . . 23
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . 23
Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Lockout Protection . . . . . . . . . . . . . . . . . . . . . . 23
Power Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Low Fuel Warning Light . . . . . . . . . . . . . . . . . 129
Lower Anchors and Tethers for Children (LATCH System) . . . . . . . . . . . . . . . . .81
Lumbar Adjustment . . . . . . . . . . . . . . . . . . . . . . . 50 Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
432 Index
M
MaintenanceRecords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400
Maintenance Schedule . . . . . . . . . . . . . . . . . . . 394 Recommended Fluids and
Lubricants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 398
Malfunction Indicator Lamp . . . . . . . . . . . . . . . 122
Manual Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Massage Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Media
Avoiding Untrusted Devices . . . . . . . . . . . . 163
Memory Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Messages Engine Power . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Vehicle Speed . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Mirrors Automatic Dimming . . . . . . . . . . . . . . . . . . . . 37
Automatic Dimming Rearview . . . . . . . . . . 38
Blind Spot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Folding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Interior Rearview . . . . . . . . . . . . . . . . . . . . . . . 38 Mirrors (cont'd)
Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Manual Rearview . . . . . . . . . . . . . . . . . . . . . . . 38
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Rear Camera . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Tilt in Reverse . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Trailer Tow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Mode Driver Control . . . . . . . . . . . . . . . . . . . . . . . . . 238
Monitor System, Tire Pressure . . . . . . . . . . . . 351
Multi-band Antenna . . . . . . . . . . . . . . . . . . . . . 163
Multi-Point Vehicle Inspection (MPVI) . . . . 396
N
Navigation Connected Services . . . . . . . . . . . . . . . . . . . . 422
Destination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Using the System . . . . . . . . . . . . . . . . . . . . . . 165
New Vehicle Break-In . . . . . . . . . . . . . . . . . . . . 216
Noise Control System . . . . . . . . . . . . . . . . . . . . 329
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Off-Road Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Oil
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
Engine Oil Life System . . . . . . . . . . . . . . . . . 316
Engine Oil Pressure Gauge . . . . . . . . . . . . . . 117
Pressure Light . . . . . . . . . . . . . . . . . . . . . . . . . 129
Older Children, Restraints . . . . . . . . . . . . . . . . . .75
Online Account . . . . . . . . . . . . . . . . . . . . . . . . . . 407
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416 Additional Information . . . . . . . . . . . . . . . . . 419
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417
OnStar Emergency . . . . . . . . . . . . . . . . . . . . . . . 418
OnStar Security . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Operating Mode
Overheated Engine Protection . . . . . . . . . 323
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Overheated Engine Protection Operating Mode . . . . . . . . . . . . . . . . . . . . . . . 323
Overheating, Engine . . . . . . . . . . . . . . . . . . . . . . 321
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154, 155 Instrument Panel . . . . . . . . . . . . . . . . . . . . . . . . 5P
Park
Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253, 262
Shifting Into . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Shifting Out of . . . . . . . . . . . . . . . . . . . . . . . . 221