2023 GMC SIERRA length

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
76 Seats and Restraints
.Buckle the lap-shoulder belt. Does the
shoulder belt rest on the shoulder? If yes,
continue. If no, try using the rear seat
belt comfort guide, if available. See“Rear
Seat Belt Comfort Guides” under
Lap-Shoulder Belt 061. If a comfort guide
is not available, or if the shoulder belt
still does not rest on the shoulder, then
return to the booster seat.
.Does the lap belt fit low and snug on the
hips, touching the thighs? If yes, continue.
If no, return to the booster seat.
.Can proper seat belt fit be maintained for
the length of the trip? If yes, continue.
If no, return to the booster seat.
Q: What is the proper way to wear seat belts?
A: An older child should wear a lap-shoulder
belt and get the additional restraint a
shoulder belt can provide. The shoulder
belt should not cross the face or neck.
The lap belt should fit snugly below the
hips, just touching the top of the thighs.
This applies belt force to the child's
pelvic bones in a crash. It should never
be worn over the abdomen, which could
cause severe or even fatal internal
injuries in a crash. Also see
“Rear Seat Belt Comfort Guides”
under Lap-Shoulder Belt 061.
According to accident statistics, children are
safer when properly restrained in a rear
seating position.
In a crash, children who are not buckled up
can strike other people who are buckled up,
or can be thrown out of the vehicle. Older
children need to use seat belts properly.
{Warning
Never allow more than one child to wear
the same seat belt. The seat belt cannot
properly spread the impact forces. In a
crash, they can be crushed together and
seriously injured. A seat belt must be
used by only one person at a time.
{Warning
Never allow a child to wear the seat belt
shoulder belt under both arms or behind
their back. A child can be seriously
injured by not wearing the lap-shoulder
belt properly. In a crash, the child would
not be restrained by the shoulder belt.
The child could move too far forward
increasing the chance of head and neck
injury. The child might also slide under
the lap belt. The belt force would then be
applied right on the abdomen. That could
cause serious or fatal injuries. The
shoulder belt should go over the shoulder
and across the chest.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
88 Seats and Restraints
Regular Cab Models1. For models without a rear seat, forward-facing child restraints should
only be installed in the right front
seating position with belts and a top
tether. See Securing Child Restraints
(With the Seat Belt in the Center Front
Seat) 099 or
Securing Child Restraints (With the Seat
Belt in the Rear Seat) 092 or
Securing Child Restraints (With the Seat
Belt in the Front Passenger Seat) 096.
If the child restraint manufacturer
recommends that the top tether be
attached, adjust the top tether to its full
length and attach it to the anchor. Refer
to the child restraint instructions and the
following steps:
1.1. Find the top tether anchor.
1.2. Route, attach, and tighten the top tether according to your child
restraint instructions and the
following instructions:
If the position you are using has an
adjustable headrest or head
restraint, adjust it accordingly to
allow proper fitment. If you are
using a dual tether, route the
tether around the headrest or head
restraint posts.
If the child restraint is installed next
to a center seat, make sure the top
tether does not interfere with the
center seating position shoulder
belt/retractor. If it does, find
another suitable seating position to
install the child restraint.If the position you are using has an
adjustable headrest or head
restraint, adjust it accordingly to
allow proper fitment. If you are
using a single tether, route the
tether in between the headrest or
head restraint posts.
2. Make sure the child restraint top tether hook is completely closed and secured to
the top tether anchor.
3. Secure the child restraint in the right front seating position with the vehicle
belts. See Securing Child Restraints (With
the Seat Belt in the Center Front Seat)
0 99 or
Securing Child Restraints (With the Seat
Belt in the Rear Seat) 092 or
Securing Child Restraints (With the Seat
Belt in the Front Passenger Seat) 096.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/18/22
Infotainment System 189
To delete Report Card data, do one of the
following:
.From the Report Card display, touch
Reset.
.Touch Clear PIN and All Teen Driver Keys
from the Teen Driver menu. This will also
unregister any Teen Driver keys and
delete the PIN.
Forgotten PIN
See your dealer to reset the PIN.
Trademarks and License
Agreements
FCC Information
See Radio Frequency Statement 0404.
"Made for iPhone," means that an electronic
accessory has been designed to connect
specifically to iPhone, and has been certified
by the developer to meet Apple
performance standards. Apple is not responsible for the operation of this device
or its compliance with safety and regulatory
standards. Please note that the use of this
accessory with iPhone may affect wireless
performance. iPhone are trademarks of
Apple Inc., registered in the U.S. and other
countries.
Trial length and service availability may vary
by model, model year or trim. Service will
automatically stop at the end of your trial
subscription period unless you decide to
continue service. If you do not wish to enjoy
your trial, you can cancel by calling the
number below. All SiriusXM services require
a subscription, each sold separately by
SiriusXM after the trial period.
Service
subject to the applicable SiriusXM Customer
Agreement and Privacy Policy, visit
www.siriusxm.com (USA) or
www.siriusxm.ca (Canada) to see complete
terms and how to cancel which includes
calling 1-866-635-2349 (USA) or
1-888-539-7474 (Canada). Some services andfeatures are subject to device capabilities
and location availability. Content varies by
SiriusXM subscription package. All fees,
content and features are subject to change.
SiriusXM with 360L: Some features,
including steaming content and listening
recommendations, require an active OnStar
Connected Access plan and may vary by
vehicle model. Content varies by SiriusXM
subscription plan. GM connected vehicle
services vary by vehicle model and require
active service plan, working electrical
system, cell reception and GPS signal. See
onstar.com for details and limitations.
SiriusXM, Pandora, Stitcher and all related
logos are trademarks of Sirius XM Radio Inc.
and its respective subsidiaries.
SiriusXM satellite service is only available in
the 48 contiguous United States (and Puerto
Rico with limited availability) and Canada.
In Canada: Some deterioration of service
may occur in extreme northern latitudes.
This is beyond the control of SiriusXM.
Explicit Language Notice: Channels with
frequent explicit language are indicated with
an
“XL” preceding the channel name.
Family-friendly packages are available by
contacting SiriusXM:

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Driving and Operating 227
Warning (Continued)
.Before starting the vehicle, unplug the
cord, reattach the cover to the plug,
and securely fasten the cord. Keep the
cord away from any moving parts.
5. Before starting the engine, be sure to unplug and store the cord.
The length of time the heater should remain
plugged in depends on several factors. Ask a
dealer in the area where you will be parking
the vehicle for the best advice on this.
Retained Accessory Power (RAP)
When the vehicle is turned from on to off,
the following features (if equipped) will
continue to function for up to 10 minutes,
or until the driver door is opened. These
features will also work when the vehicle is
on or in accessory mode:
.Infotainment System
.Power Windows (during RAP this
functionality will be lost when any door
is opened)
.Sunroof (during RAP this functionality will
be lost when any door is opened)
.Auxiliary Power Outlet
.Audio System
.OnStar System
Shifting Into Park
{Warning
Parking on grades with poor traction such
as ice, snow, mud, or gravel may cause
the vehicle to unintentionally move and
could result in injury, death, and/or
vehicle damage. If equipped with
four-wheel drive, use AUTO or 4 (HI) to
provide additional traction. Be sure to
apply the parking brake. See Electric
Parking Brake 0239 and
Four-Wheel Drive 0234.
{Warning
It can be dangerous to get out of the
vehicle if the shift lever is not fully in
P (Park) with the parking brake firmly set.
The vehicle can roll. If you have left the
engine running, the vehicle can move
suddenly. You or others could be injured.
To be sure the vehicle will not move,
even when you are on fairly level ground,
(Continued)
Warning (Continued)
use the steps that follow. With
four-wheel drive, if the transfer case is in
N (Neutral), the vehicle will be free to
roll, even if the shift lever is in P (Park).
Be sure the transfer case is in a drive
gear. If towing a trailer, seeDriving
Characteristics and Towing Tips 0268.
1. Hold the brake pedal down, then set the parking brake. See Electric Parking Brake
0 239.
2. Move the shift lever into the P (Park) position by pulling the shift lever toward
you and moving it up as far as it will go.
3. Be sure the transfer case (if equipped) is in a drive gear –not in N (Neutral).
4. Turn the ignition off. For Key Access, push the ignition key in, towards the
steering column and then turn the
ignition off.
5. For Key Access, remove the key and take it with you. If you can leave the vehicle
with the ignition key in your hand, the
vehicle is in P (Park).
For Keyless Access, take the remote key
with you.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Driving and Operating 243
Noise from the Electronic Brake Control
Module (EBCM) is normal when HDC is
active.
When HDC is activated, the initial HDC
speed is set to the current driving speed.
It can be increased or decreased by pressing
+RES or SET- on the steering wheel, or by
applying the accelerator or brake pedal. This
adjusted speed becomes the new set speed.
HDC will remain enabled between 30 and
60 km/h (19 and 37 mph); however, vehicle
speed cannot be set or maintained in this
range. HDC will automatically disable if the
vehicle speed is above 80 km/h (50 mph) or
above 60 km/h (37 mph) for at least
30 seconds.
5must be pressed again to re-enable HDC.
HDC may disable after an extended period
of use. If this happens, HDC will require
time to cool down. The length of time HDC
remains active depends on road conditions,
grade, set speed, vehicle loading, and
outside temperature.
When enabled, if the vehicle speed is above
30 km/h (19 mph) and below 60 km/h
(37 mph), a DIC message will display.
Driver Mode Control
Driver Mode Control (DMC) allows the driver
to adjust the overall driving experience to
better suit preference by adjusting multiple
systems to fit specific driving needs. Drive
mode availability and affected vehicle
subsystems are dependent upon vehicle trim
level, region, and optional features.
Mode Activation
To activate Tow/Haul Mode turn the knob
counterclockwise. To activate other drive
modes turn the knob clockwise.
Modes:
Normal Mode : Use for normal city and
highway driving to provide a smooth ride.
This setting provides balance between
comfort and handling. This is the standard/
default mode. There is no persistent
indicator in the instrument cluster for
this mode.
6Snow/Ice Mode : Snow/Ice Mode
improves vehicle acceleration on snow and
ice covered roads. When active, Snow/Ice
Mode will adjust acceleration to optimize
traction on slippery surfaces. This can
compromise the acceleration on dry asphalt.
This feature is not intended for use when
the vehicle is stuck in sand, mud, ice, snow,
or gravel. If the vehicle becomes stuck, see If
the Vehicle Is Stuck 0214.
7Off-Road Mode : Use this mode for
off-road recreational driving. Off-Road Mode
should be used to improve driving at
moderate speeds, on grass, gravel, dirt,
unpaved roads, or snow-covered roads. The
accelerator pedal is tuned for off-road use.
This mode modifies pedal mapping,
transmission shift pattern, Antilock Brake

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Driving and Operating 253
an accessory trailer camera on the
rear exterior surface of the trailer
per the accessory trailer camera
installation instructions (see your
dealer for accessory trailer
camera(s) and information). To
view, select Picture-in-Picture Side
View on the infotainment display
when the Camera App is active. To
access this view when in a forward
gear above 12 km/h (8 mph), select
CAMERA on the infotainment
display and select Picture-in-Picture
Side View. The view can be closed
by selecting X, Home or Back.
Additional Views and Alerts
.Turn Signal Activated Views
Displays a rearward view of the left or
right side of the vehicle and trailer when
a trailer is connected. Views are provided
based on turn signal activation with the
right-side view being shown when the
right turn signal is active and the left side
view being shown when the left turn
signal is active. The feature can be
enabled or disabled.To view available
settings from the infotainment screen, touch Settings > Vehicle > Collision/
Detection Systems. The view can be
closed early by selecting X, Home or Back.
A Trailer Length Indicator Overlay is
available in the Turn Signal Activated
Views when the trailer is relatively
straight behind the vehicle and a
compatible profile is configured and
selected via the Trailering App. The
overlay will not be visible when the
position of the trailer is too far to the left
or right. The overlay can be enabled or
disabled. To view available settings from
the infotainment screen, touch Settings >
Vehicle > Collision/Detection Systems.
.Jack-Knife Detection and Alert
The vehicle may be equipped with
Jack-Knife Detection. The system will track
the position of the trailer relative to the
vehicle. As the front of the trailer
approaches the rear of the vehicle, a
warning or an alert will be displayed.
A warning indicates to the driver to
proceed with caution, an alert indicates
that a collision is imminent. Based on
vehicle equipment and user settings, the
visual warning or alert may be
accompanied by audible or safety alert
seat notifications. To view availablesettings from the infotainment screen,
touch Settings > Vehicle > Collision/
Detection Systems.
.Trailer Angle Indicator
The vehicle may be equipped with a
Trailer Angle Indicator. The Trailer Angle
Indicator gives the driver a visual
representation of the trailer’s position
relative to the vehicle. (Available only in
Reverse, Guidelines On, Rear Trailering
Views).
{Warning
Use Hitch Guidance only to help back the
vehicle to a trailer hitch or, when
traveling above 12 km/h (8 mph), to
briefly check the status of your trailer. Do
not use for any other purpose, such as
making lane change decisions. Before
making a lane change, always check the
mirrors and glance over your shoulder.
Improper use could result in serious
injury to you or others.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Driving and Operating 289
trailer tires are rotated or replaced. See
“Editing a Trailer Profile”later in this section
for tire pressure sensor relearn information.
Tool Method: A TTPMS activation tool can
be purchased separately to learn the sensor
locations.
Manual Method: Without the tool, the air
pressure can be increased or decreased in
each tire for 10 seconds. Do not exceed the
maximum inflation pressure found on the
tire sidewalls. Make sure to re-adjust tire
pressure to the recommended level when
the process is complete.
Sensor Learning Steps
To complete the sensor-to-vehicle learn
process:
1. Touch Start on the Learn Sensors screen. The horn chirps twice and the Learning
Active screen appears on the
infotainment display.
2. Start with the driver side front trailer tire.
3. Activate the tool near the valve stem or adjust the air pressure of this tire until
the horn chirps and all working vehicle
and trailer lights flash. The process stops without saving the
sensor locations if this step takes more
than two minutes.
4. Move to the next tire and repeat Step 3 for each sensor. The horn chirps twice
when all sensors are completed.
5. Return to the vehicle to complete the setup.
Maintenance Reminders
To set up maintenance reminders, touch the
Trailer Maintenance icon. Select Yes to set
up the maintenance reminders for the
Trailer Profile. Follow the on-screen prompts.
The maximum number of reminders is 50.
Select No to return to the previous screen.
Towing Assistance
To set up towing assistance features,
if equipped, touch the Towing
Assistance icon.
Touch Yes to begin set up or touch No to
return to the previous screen.
1. Select the number of axles on the trailer.
2. Enter trailer dimensions as prompted.
3. Follow the on-screen instructions to complete setup for available features. Certain trailer features require a compatible
trailer profile configured and selected.
A compatible trailer is a box type trailer
(cargo, camper, etc.) with a conventional
hitch.
Transparent Trailer Setup
If equipped, a rear trailer camera must be
mounted on the trailer and electrically
connected to the vehicle before transparent
trailer feature can be used. See
Assistance
Systems for Parking or Backing 0248.
Trailer dimensions must be in range and the
transparent trailer must be calibrated prior
to use:
.Trailer Length: 300 cm (118.1 in) –970 cm
(381.8 in). Measure from center of coupler
to furthest rear point on the trailer.
.Trailer Width: 120 cm (47.2 in) –260 cm
(102.3 in). Measure from left edge to
right edge.
.Trailer Height: 1 cm (0.39 in) –450 cm
(177.1 in). Measure from ground to tallest
point.
.Hitching Point Length: 180 cm (70.8 in) –
970 cm (381.8 in). Measure from center of
coupler to middle of tires.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
290 Driving and Operating
.Trailer Tongue Length: 50 cm (19.6 in)–
220 cm (86.6 in). Measure from center of
coupler to trailer front wall.
.Vehicle Hitch Height: 10 cm (3.9 in) –
100 cm (39.3 in). Measure from ground to
top of coupler.
.Vehicle Hitch Length: 10 cm (3.9 in) –
100 cm (39.3 in). Measure from hitch
receiver to center of ball.
1. If trailer dimensions are out of range, this feature will be unavailable.
2. Ensure rear trailer camera is connected.
3. Follow instructions to drive forward to complete calibration.
Rear Trailer Guidance Setup
If equipped, a rear trailer camera must be
mounted on the trailer and electrically
connected to the vehicle before rear trailer
guidance feature can be used. See Assistance
Systems for Parking or Backing 0248.
Trailer dimensions must be in range to
enable this feature.
.Trailer Length: 300 cm (118.1 in) –970 cm
(381.8 in). Measure from center of coupler
to furthest rear point on the trailer.
1. If trailer dimensions are out of range, this feature will be unavailable. 2. Ensure rear trailer camera is connected.
3. Follow instructions to drive forward to
complete calibration.
Jack-Knife Alert Setup
If equipped, follow instructions to drive
forward to complete calibration.
Trailer Length Indicator Setup
If equipped, follow instructions to drive
forward to complete calibration.
Trailer Side Blind Zone Alert Setup
If equipped, trailer dimensions must be in
range to enable this feature.
.Trailer Length: 300 cm (118.1 in) –
1200 cm (472.4 in). Measure from center
of coupler to furthest rear point on the
trailer.
If trailer dimensions are out of range, this
feature will be unavailable.
Status View
The Status view shows:
.Vehicle
.Connections
.Tires
.Maintenance
.Cameras
Upon entry, the most recent items will be
shown. Select MORE to view all options.
Vehicle
1. Transmission Fluid Temperature
2. Average Fuel Economy with Trailer Profile
Transmission Temperature
View the temperature of the transmission
fluid by looking at the graphic. The graphic
will indicate a dangerous level if the
temperature is at 130 °C–150 °C
(270 °F–300 °F).