ECU GMC SIERRA 2024 Owners Manual

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/13/22
Introduction 9
1.Head-Up Display (HUD) 0135 (If
Equipped).
2. Air Vents 0196.
3. Turn Signal Lever. See Turn and
Lane-Change Signals 0147.
Windshield Wiper/Washer 0106.
4. Instrument Cluster (Base Level) 0112 or
Instrument Cluster (Uplevel) 0113.
5. Shift Lever. See Automatic Transmission
0 223.
Range Selection Mode. See Manual Mode
0 226.
6. Infotainment System. See Overview
(Uplevel Radio) 0155 or
Overview (Base Radio) 0154.
7. Light Sensor. See Automatic Headlamp
System 0145.
Vehicle Alarm System. See Vehicle
Security 032.
8. Upper Glove Box. See Glove Box099.
9. Lower Glove Box. See Glove Box099.
10. Upper Glove Box Button. See Glove Box
0 99. 11. Power Release Tailgate (If Equipped). See
Tailgate 024.
Hazard Warning Flashers 0146.
Traction Control/Electronic Stability
Control 0236.
Hill Descent Control Switch (If Equipped).
See Hill Descent Control (HDC) 0237.
Power Assist Steps 031 (If Equipped).
Express Window Down Button (If
Equipped). See Power Windows 042.
Tow/Haul Mode 0227 (On Some
Models).
Exhaust Brake (If Equipped). See Duramax
Diesel Supplement.
Power Take-Off (PTO) (If Equipped). See
Duramax Diesel Supplement.
12. USB Port 0163.
13. Climate Control Systems 0191 (If
Equipped).
Dual Automatic Climate Control System
0 193 (If Equipped).
Heated and Ventilated Front Seats 054
(If Equipped).
Heated Steering Wheel 0105 (If
Equipped). 14. Front Center Console Storage.
15.
Cupholders 0100.
16. Trailer Brake Control Panel (If Equipped). See“Integrated Trailer Brake Control
System” underTowing Equipment 0284.
17. ENGINE START/STOP. See Ignition
Positions 0216.
18. Steering Wheel Controls 0156.
Driver Information Center (DIC) Controls.
See Driver Information Center (DIC) (Base
Level) 0131 or
Driver Information Center (DIC) (Uplevel)
0 133.
19. Horn 0106.
20. Steering Wheel Adjustment 0105 (Out
of View).
21. Hood Release. See Hood0312.
22. Cruise Control 0239.
Adaptive Cruise Control (Camera) 0241
(If Equipped).
Forward Collision Alert (FCA) System
0 263 (If Equipped).

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/13/22
12 Introduction
1.Air Vents 0196.
2. Head-Up Display (HUD) 0135 (If
Equipped).
3. Turn Signal Lever. See Turn and
Lane-Change Signals 0147.
Windshield Wiper/Washer 0106.
4. Instrument Cluster (Base Level) 0112 or
Instrument Cluster (Uplevel) 0113.
5. Shift Lever. See Automatic Transmission
0 223.
Range Selection Mode. See Manual Mode
0 226.
6. Infotainment System. See Overview
(Uplevel Radio) 0155 or
Overview (Base Radio) 0154.
7. Light Sensor. See Automatic Headlamp
System 0145.
Vehicle Alarm System. See Vehicle
Security 032.
8. Upper Glove Box Button. See Glove Box
0 99.
9. Upper Glove Box. See Glove Box099.
10. Lower Glove Box. See Glove Box099. 11.
Climate Control Systems 0191 (If
Equipped).
Dual Automatic Climate Control System
0 193 (If Equipped).
Heated and Ventilated Front Seats 054
(If Equipped).
Heated Steering Wheel 0105 (If
Equipped).
12. Power Release Tailgate (If Equipped). See Tailgate 024.
Hazard Warning Flashers 0146.
Traction Control/Electronic Stability
Control 0236.
Hill Descent Control Switch (If Equipped).
See Hill Descent Control (HDC) 0237.
Power Assist Steps 031 (If Equipped).
Express Window Down Button (If
Equipped). See Power Windows 042.
Tow/Haul Mode 0227 (On Some
Models).
Exhaust Brake (If Equipped). See Duramax
Diesel Supplement.
Power Take-Off (PTO) (If Equipped). See
Duramax Diesel Supplement. 13. Front Center Console Storage.
14.
USB Port 0163.
15. Cupholders 0100.
16. Trailer Brake Control Panel (If Equipped). See“Integrated Trailer Brake Control
System” underTowing Equipment 0284.
17. ENGINE START/STOP. See Ignition
Positions 0216.
18. Steering Wheel Controls 0156.
Driver Information Center (DIC) Controls.
See Driver Information Center (DIC) (Base
Level) 0131 or
Driver Information Center (DIC) (Uplevel)
0 133.
19. Horn 0106.
20. Hood Release. See Hood0312.
21. Steering Wheel Adjustment 0105 (Out
of View).
22. Cruise Control 0239.
Adaptive Cruise Control (Camera) 0241
(If Equipped).
Forward Collision Alert (FCA) System
0 263 (If Equipped).

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
14 Keys, Doors, and Windows
Keys, Doors, and
Windows
Keys and Locks
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Remote Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Remote Key Operation . . . . . . . . . . . . . . . . . . 15
Remote Vehicle Start . . . . . . . . . . . . . . . . . . . 21
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . 23
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . 23
Automatic Door Locks . . . . . . . . . . . . . . . . . . 23
Lockout Protection . . . . . . . . . . . . . . . . . . . . . . 23
Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Doors
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Transporting Items That CanCatch Fire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Power Assist Steps . . . . . . . . . . . . . . . . . . . . . . 31
Vehicle Security
Vehicle Security . . . . . . . . . . . . . . . . . . . . . . . . 32
Vehicle Alarm System . . . . . . . . . . . . . . . . . . 32
Steering Column Lock . . . . . . . . . . . . . . . . . . . 33
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Immobilizer Operation . . . . . . . . . . . . . . . . . . 33
Exterior Mirrors
Convex Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . 34
Manual Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . 34
Trailer-Tow Mirrors . . . . . . . . . . . . . . . . . . . . . 35
Power Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . 36
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . 37
Automatic Dimming Mirror . . . . . . . . . . . . . 37
Blind Spot Mirrors . . . . . . . . . . . . . . . . . . . . . . 37
Reverse Tilt Mirrors . . . . . . . . . . . . . . . . . . . . . 38
Interior Mirrors
Interior Rearview Mirrors . . . . . . . . . . . . . . . 38
Manual Rearview Mirror . . . . . . . . . . . . . . . . 38
Automatic Dimming Rearview Mirror . . . 38
Rear Camera Mirror . . . . . . . . . . . . . . . . . . . . 38
Truck Bed Camera Rearview Mirror . . . . . 41
Windows
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Power Windows . . . . . . . . . . . . . . . . . . . . . . . . 42
Rear Windows . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Keys and Locks
Keys
{Warning
Leaving children in a vehicle with a
remote key is dangerous and children or
others could be seriously injured or killed.
They could operate the power windows
or other controls or make the vehicle
move. The windows will function with
the remote key in the vehicle, and
children or others could be caught in the
path of a closing window. Do not leave
children in a vehicle with a remote key.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
24 Keys, Doors, and Windows
Safety Locks
The rear door safety locks prevent
passengers from opening the rear doors
from inside the vehicle.
The safety lock is on the inside edge of the
rear doors. To use the safety lock:1. Move the lever down to the lock position.
2. Close the door.
3. Do the same for the other rear door. To open a rear door when the safety lock
is on:
1. Unlock the door by activating the inside handle, by pressing the power door
unlock switch, or by using the
remote key.
2. Open the door from the outside.
When the safety lock is enabled, adults and
older children will not be able to open the
rear door from the inside. Cancel the safety
locks to enable the doors to open from the
inside.
To cancel the safety lock: 1. Unlock the door and open it from the outside.
2. Move the lever up to unlock. Do the same for the other door.
Doors
Tailgate
Manual Tailgate
{Warning
It is extremely dangerous to ride on the
tailgate, even when the vehicle is
operated at low speeds. People riding on
the tailgate can easily lose their balance
and fall in response to vehicle maneuvers.
Falling from a moving vehicle may result
in serious injuries or death. Do not allow
people to ride on the tailgate. Be sure
everyone in your vehicle is in a seat and
using a seat belt properly.
Use the key to unlock the tailgate.
Open the tailgate by lifting up on its handle
while pulling the tailgate down.
To shut the tailgate, firmly push it upward
until it latches.
After closing the tailgate, pull it back to be
sure it is latched securely.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Keys, Doors, and Windows 25
Some tailgates have an electric latch. If the
battery is disconnected or has low voltage,
the tailgate will not open. The tailgate will
resume operation when the battery is
reconnected or recharged.
Power Release Tailgate
{Warning
Make sure there is no one in the way of
the power tailgate as it is opening and
closing, and keep hands away from the
tailgate hinges when in use. You or
others could be injured if caught in the
path of the power tailgate or tailgate
hinges.
Caution
To avoid damage to the tailgate, make
sure the area behind the tailgate is clear
before opening it.
In the case of a dead battery, the tailgate
can be opened manually. Contact your
dealer or Roadside Assistance. If equipped, to lock or unlock the tailgate,
use the remote key or the key. See
Remote
Key Operation 015.
The vehicle must be in P (Park).
To open the tailgate:
.Pressxtwice quickly on the remote
key until the tailgate moves.
.Press5on the center stack.
.Press the touch pad on the tailgate
handle after unlocking all doors. Use the
top of the tailgate to pull against if
assistance is required. If equipped with
Keyless Access, a locked tailgate can be
opened if the remote key is within
1 m (3 ft).
To close the tailgate, firmly push it upward
until it latches. Pull it back to be sure it is
latched securely.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
28 Keys, Doors, and Windows
Switches in the inner tailgate prevent the
primary tailgate from being opened when
the inner tailgate is not fully closed.
To open the primary tailgate:
.Pressxtwice quickly on the remote
key until the tailgate moves. See Remote
Key Operation 015. If equipped with
Keyless Access, the tailgate can be
opened if the remote key is within
1 m (3 ft).
.Press5on the center stack.
.Press the lower touch pad on the tailgate
handle after unlocking all doors. Use the
top of the tailgate to pull against if
assistance is required.
To close the primary tailgate, firmly push it
upward until it latches. Pull it back to be
sure it is latched securely.
To open the inner tailgate, press the upper
touch pad on the tailgate handle after
unlocking all doors. Pull the top of the
tailgate to open.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Keys, Doors, and Windows 29
Caution
Do not open the inner tailgate with the
primary tailgate open if there is a hitch
ball or trailer attached. This may damage
the tailgate.
To close the inner tailgate with the primary
tailgate closed, firmly push or pull it upward
until it latches. Pull it back to be sure it is
latched securely.
To close the inner tailgate with the primary
tailgate open:
.Hold the primary tailgate and firmly close
the inner tailgate.
.Raise the inner tailgate so it meets the
primary tailgate and close together at the
same time.
When using the tailgate step as a load stop,
the load must be secured as the load could
shift. See Cargo Tie-Downs 0102.
MultiPro Inner Tailgate Enable/Disable
The MultiPro inner tailgate may be equipped
with an enable/disable feature to prevent
the inner tailgate from being opened when
a hitch or other equipment is installed that
could damage the inner tailgate.
To disable the inner tailgate from opening:
ensure that the remote key is within
1 meter (3 ft) of the rear bumper and then
hold the upper touchpad on the tailgate
handle for up to seven seconds. The tail
lamps will flash to alert you that the inner
gate has been disabled. The inner and outer
tailgate can still be operated like a
traditional tailgate, but the inner gate will
not be able to be opened alone. To enable the inner tailgate function, hold
the upper touchpad on the handle for up to
seven seconds until the tail lamps flash. The
inner tailgate can now be opened separately
from the outer tailgate.
Tailgate Step (Step Mode)
{Warning
To avoid personal injury, keep hands
away from the hinges when operating
the tailgate step.
With the primary and inner tailgates open,
the tailgate step can be lowered to access
the pickup bed.
Using the Step
Caution
When using the tailgate as a step, the
load rating is 170 kg (375 lb), which
includes a person and cargo. Overloading
the tailgate step can cause damage to
the tailgate system.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Keys, Doors, and Windows 31
Alternate Method
When applying any load to the tailgate,
distribute the weight evenly across the
width of the tailgate. This applies to all
tailgate types.
.Use a load-distributing member (1).
.Secure the ramp to the bumper (2).
Transporting Items That Can
Catch Fire
{Warning
To avoid personal injury and/or vehicle
damage when transporting items that
can catch fire, such as leaves, mulch, hay,
or cardboard, in the truck bed:
.Make sure items are securely
contained inside the truck bed. Never
allow them to hang over the sides or
fall in between the truck bed and
the cab.
.Never place items between the cab
and the truck bed. They could touch
hot exhaust parts and ignite.
{Warning
Keep cigarettes, sparks, and other ignition
sources away from the area between the
bed of the truck and cab. They could fall
onto the fuel system below and start a
fire. You or others could be injured
and/or the vehicle damaged.
Power Assist Steps
{Warning
To avoid personal injury or property
damage, before entering or exiting the
vehicle, be sure the power assist step is
fully extended. Do not step on the power
assist step while it is moving. Never place
hands or other body parts between the
extended power assist step and the
vehicle.
If equipped, the power assist steps will
deploy when the door is opened and
automatically retract three seconds after the
door is closed. The power assist steps will
retract immediately if the vehicle starts
moving. Check the step position before
exiting the vehicle.
Disable the power assist steps before jacking
or placing any object under the vehicle.
Too much ice buildup may prevent
deployment of the power assist steps. If this
happens, disable the power assist steps,
clear the ice, then enable the assist steps
and confirm normal function prior to use.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
32 Keys, Doors, and Windows
Keep hands, children, pets, objects, and
clothing clear of the power assist steps
when in motion. The steps will reverse
direction if they encounter an obstruction
when opening or closing. Remove the
obstruction, then open and close the door
on the same side to complete the motion of
the assist steps. If the obstruction is not
cleared, the assist steps remain extended
while driving.
Extend or retract both power assist steps
for cleaning through the vehicle settings
menu. To view available settings from the
infotainment screen, touch Settings >
Vehicle > Comfort and Convenience.
Enable/Disable
The power assist steps can be enabled or
disabled through the vehicle settings menu.
To view available settings from the
infotainment screen, touch Settings >
Vehicle > Comfort and Convenience.
Vehicle Security
This vehicle has theft-deterrent features;
however, they do not make the vehicle
impossible to steal.
Vehicle Alarm System
The indicator light, on the instrument panel
near the windshield, indicates the status of
the system.
Off :Alarm system is disarmed.
On Solid : Vehicle is secured during the
delay to arm the system.
Fast Flash : Vehicle is unsecured. A door or
the hood is open.
Slow Flash : Alarm system is armed.
Arming the Alarm System
1. Turn off the vehicle. 2. Lock the vehicle in one of two ways:
.Use the remote key.
.With a door open, pressQon the
interior of the door.
3. After 30 seconds, the alarm system will arm and the indicator light will begin to
slowly flash. Pressing
Qon the remote
key a second time will bypass the
30-second delay and immediately arm
the alarm system.
The vehicle alarm system will not arm if the
doors are locked with the key.
If the driver door is opened without first
unlocking with the remote key, the horn will
chirp and the lights will flash to indicate
pre-alarm. If the vehicle is not started,
or the door is not unlocked by pressing
K
on the remote key during the 10-second
pre-alarm, the alarm will be activated.
The alarm will also be activated if a
passenger door or the hood is opened
without first disarming the system. When
the alarm is activated, the turn signals flash
and the horn sounds for about 30 seconds.
The alarm system will then re-arm to
monitor for the next unauthorized event.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
34 Keys, Doors, and Windows
The security light, in the instrument cluster,
comes on if there is a problem with arming
or disarming the theft-deterrent system.
The system has one or more remote keys
matched to an immobilizer control unit in
your vehicle. Only a correctly matched
remote key will start the vehicle. If the
remote key is ever damaged, you may not
be able to start your vehicle.
When trying to start the vehicle, the
security light may come on briefly when the
ignition is turned on. If the engine does not
start and the security light stays on, there is
a problem with the system. Turn the
ignition off and try again.
If the vehicle will not change ignition modes
(accessory mode, on, off), and the remote
key appears to be undamaged, try another
remote key. Or, you may try placing the
remote key in the remote key pocket
located in the center console. SeeRemote
Key Operation 015.
If the ignition mode will not change with
the other remote key or with the remote
key in the remote key pocket, your vehicle
needs service. If the ignition does change
modes, the first remote key may be faulty. See your dealer who can service the
theft-deterrent system and have a new
remote key programmed to the vehicle.
It is possible for the immobilizer system to
learn new or replacement remote keys. Up
to eight remote keys can be programmed
for the vehicle. To program additional
remote keys, see "Programming Remote
Keys to the Vehicle" under
Remote Key
Operation 015.
Do not leave the remote key or device that
disarms or deactivates the vehicle theft
system in the vehicle.
Exterior Mirrors
Convex Mirrors
{Warning
A convex mirror can make things, like
other vehicles, look farther away than
they really are. If you cut too sharply
into the right lane, you could hit a
vehicle on the right. Check the inside
mirror or glance over your shoulder
before changing lanes. Standard Mirrors
If equipped, the passenger side mirror is
convex shaped. A convex mirror surface is
curved so more can be seen from the
driver seat.
Trailer-Tow Mirrors
The upper portion of both the driver and
passenger mirrors is flat.
The lower portion of both the driver and
passenger mirrors is convex. A convex mirror
surface is curved so more can be seen from
the driver seat. The lower portion is
adjusted manually.
Manual Mirrors
If equipped, adjust manual mirrors by
moving the mirror up and down or left to
right to see a little of the side of the vehicle
and to have a clear view behind the vehicle.
Using hood-mounted air deflectors and
add-on convex mirror attachments could
decrease mirror performance.