2021 GMC SIERRA trailer

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Driving and Operating 253
When in Terrain Mode, the vehicle will shift
automatically but may hold a lower gear
longer to maximize engine torque. The
steering will change to provide more precise
control. A unique pedal map, transmission
shift pattern, and rpm control are utilized to
give better control at lower speeds and over
rough terrain. When the vehicle comes to a
stop, Vehicle Hold is engaged. TCS will be
optimized for maximum torque transfer
across axles, and Active Braking During Lift
Throttle will be engaged.
Active Braking During Lift Throttle:
.Automatically applies light braking,
similar to heavy engine braking of
four-wheel-drive low.
.Applies light braking in D (Drive) until the
vehicle is at idle speeds. In Manual L1 and
Manual L2, moderate braking may stop
the vehicle.
.Reduces trailer braking.Terrain Mode Drive
Select Expected Vehicle Behavior Ideal Terrain
Drive (L3-Lx) Minor deceleration when off
throttle and mild ability to
modulate throttle; mimics
performance of 4
nwithout torque
multiplication. Grassy fields,
mild two tracks,
rutted roads,
large rolling hills,
L2 Moderate deceleration when off
throttle and moderate ability to
modulate throttle; will bring vehicle
to a stop in most cases. Mild rock crawling,
heavy ruts,
short, steeper grades,
L1 Significant deceleration when off
throttle and significant ability to
modulate throttle; will bring vehicle
to a stop in most cases. Rock crawling downhill
Active Braking During Lift Throttle will
reduce the back and forth between the
accelerator and brake pedals.
Vehicle Hold Features:
.When the vehicle comes to a stop on an
incline grade in forward gear or on a
decline grade in reverse gear, Vehicle
Hold is engaged until the accelerator
pedal is pressed.
.When the vehicle is in forward gear on a
decline, the vehicle is allowed to creep
down the hill when the brake pedal is
released without pressing the accelerator
pedal. The vehicle will also creep forward
on flat ground.
.If the driver seat belt is removed and the
driver door is opened while the vehicle is
being held, EPB will be engaged.
.EPB will engage if the vehicle is held for
an extended period.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Driving and Operating 257
{Warning
ACC will not detect or brake for children,
pedestrians, animals, or other objects.
Do not use ACC when:
.On winding and hilly roads or when
the camera sensor is blocked by snow,
ice, or dirt. The system may not
detect a vehicle ahead. Keep the
windshield and headlamps clean.
.When visibility is poor due to rain,
snow, fog, dirt, insect residue, or dust;
when other foreign objects obscure
the camera’s view; or when the
vehicle in front or oncoming traffic
causes additional environmental
obstructions, such as road spray. ACC
performance is limited under these
conditions.
.On slippery roads where fast changes
in tire traction can cause excessive
wheel slip
.With extremely heavy cargo loaded in
the cargo area or rear seat
.When towing a trailer
J:Press to turn the system on or off. The
indicator turns white on the instrument
cluster when ACC is turned on.
RES+ : Press briefly to resume the previous
set speed or to increase vehicle speed if ACC
is already activated. To increase speed by
about 1 km/h (1 mph), press RES+ briefly. To
increase speed to the next 5 km/h (5 mph)
mark on the speedometer, hold RES+.
SET– :Press briefly to set the speed and
activate ACC or to decrease vehicle speed if
ACC is already activated. To decrease speed
by about 1 km/h (1 mph), press SET– briefly.
To decrease speed to the next 5 km/h
(5 mph) mark on the speedometer,
hold SET–.
*: Press to disengage ACC without erasing
the selected set speed.
[: Press to select a following gap setting
for ACC of Far, Medium, or Near.
The speedometer reading can be displayed
in either English or metric units. See
Instrument Cluster 0106. The increment
value used depends on the units displayed.
Switching Between ACC and Regular Cruise
Control
To switch between ACC and regular cruise
control, press and hold
*. A Driver
Information Display (DIC) message displays.
See Vehicle Messages 0130.
ACC IndicatorRegular Cruise Control
Indicator
When ACC is engaged, a green
oindicator
will be lit on the instrument cluster and the
following gap will be displayed. When the

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Driving and Operating 261
Stationary or Very Slow-Moving Objects
{Warning
ACC may not detect and react to stopped
or slow-moving vehicles ahead of you. For
example, the system may not brake for a
vehicle it has never detected moving. This
can occur in stop-and-go traffic or when a
vehicle suddenly appears due to a vehicle
ahead changing lanes. Your vehicle may
not stop and could cause a crash. Use
caution when using ACC. Your complete
attention is always required while driving
and you should be ready to take action
and apply the brakes.
Irregular Objects Affecting ACC
ACC may have difficulty detecting the
following objects:
.Vehicles in front of your vehicle that have
a rear aspect that is low, small,
or irregular
.An empty truck or trailer that has no
cargo in the cargo bed
.Vehicles with cargo extending from the
back end
.Non-standard shaped vehicles, such as
vehicle transport, vehicles with a side car
fitted, or horse carriages
.Vehicles that are low to the road surface
.Objects that are close to the front of your
vehicle
.Vehicles on which extremely heavy cargo
is loaded in the cargo area or rear seat
ACC Automatically Disengages
ACC may automatically disengage and the
driver will need to manually apply the
brakes to slow the vehicle if:
.The front camera is blocked or visibility is
reduced.
.The Traction Control System (TCS) or
StabiliTrak/ESC system has activated or
been disabled.
.There is a fault in the system.
.A DIC message displays to indicate that
ACC is temporarily unavailable.
The ACC indicator will turn white when ACC
is no longer active.
In some cases, when ACC is temporarily
unavailable, regular cruise control may be
used. See “Switching Between ACC and
Regular Cruise Control” previously in this
section. Always consider driving conditions
before using either cruise control system.
Notification to Resume ACC
ACC will maintain a follow gap behind a
detected vehicle and slow your vehicle to a
stop behind that vehicle.
If the stopped vehicle ahead has driven
away and ACC has not resumed, the vehicle
ahead indicator will flash as a reminder to
check traffic ahead before proceeding. In
addition, the left and right sides of the
Safety Alert Seat will pulse three times,
or three beeps will sound. See ”Alert Type”
and “Adaptive Cruise Go Notifier” in
“Collision/Detection Systems” underVehicle
Personalization 0131.
When the vehicle ahead drives away, press
RES+ or the accelerator pedal to resume
ACC. If stopped for more than two minutes
or if the driver door is opened and the

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Driving and Operating 263
When following a vehicle and entering a
curve, ACC may not detect the vehicle ahead
and accelerate to the set speed. When this
happens, the vehicle ahead indicator will not
appear.
ACC may detect a vehicle that is not in your
lane and apply the brakes.
ACC may occasionally provide an alert and/
or braking that is considered unnecessary.
It could respond to vehicles in different
lanes or stationary objects when entering or
exiting a curve. This is normal operation.
The vehicle does not need service.Other Vehicle Lane Changes
ACC will not detect a vehicle ahead until it
is completely in the lane. The brakes may
need to be manually applied.
Objects Not Directly in Front of Your Vehicle
The detection of objects in front of the
vehicle may not be possible if:
.The vehicle or object ahead is not within
your lane.
.The vehicle ahead is shifted, not centered,
or is shifted to one side of the lane.
Driving in Narrow Lanes
Vehicles in adjacent traffic lanes or roadside
objects may be incorrectly detected when
located along the roadway. Do Not Use ACC on Hills and When Towing a
Trailer
Do not use ACC when driving on steep hills
or when towing a trailer. ACC will not detect
a vehicle in the lane while driving on steep
hills. If the brakes are applied, ACC
disengages.
Disengaging ACC
There are three ways to disengage ACC:
.Step lightly on the brake pedal.
.Press*.
.PressJ.
Erasing Speed Memory
The ACC set speed is erased from memory if
Jis pressed or if the ignition is turned off.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
268 Driving and Operating
Camera Views
Touch the camera view buttons along the
bottom of the infotainment display to
access each view (if equipped):
1. Front/Rear Standard View
Displays an image of the area in front
or behind the vehicle. To select, touch
Front/Rear Standard View on the
infotainment display when a camera
view is active. Touch the button to
toggle between front and rear camera
views.
When the hitch guidance is selected,
Rear Standard View will remain visible
across gear changes, otherwise theview will toggle between Front and
Rear Standard View based on gear
position.
If equipped, the front view camera
also displays when the Park Assist
system detects an object within
30 cm (12 in).
2. Front/Rear Overhead View
Displays a front or rear overhead view
of the vehicle. To select, touch Front/
Rear Top-Down View on the
infotainment display when a camera
view is active. Touch the button to
toggle between front and rear camera
views.
3. Rear Bowl View
Displays a perspective view of the
vehicle from the front looking
rearward. To select, touch Rear Bowl
View on the infotainment display
when a camera view is active. Park
Assist and Rear Cross Traffic Alert
(RCTA) overlays are not available when
bowl view is active.
4. Front/Rear side View
Displays a view that shows objects
next to the front or rear sides of the
vehicle. To select, touch Front/Rear
Side View on the infotainment displaywhen a camera view is active. Touch
the button to toggle between front
and rear camera views. Park Assist and
RCTA overlays are not available when
Front/Rear Side View is active.
The Turn Signal Activated View works
with Rear Side View to provide a
rearward view of the left or right side
of the vehicle and trailer. 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 is available when
a trailer is connected. The feature can
be enabled or disabled. See
Vehicle
Personalization 0131. Touch X to exit.
5. Surround View
Displays an image of the area
surrounding the vehicle. Surround
View is available as part of the Front/
Rear Standard Views, the Front/Rear
Top-Down Views and the Front/Rear
Side Views. In these views Surround
View can be enabled by touching
Surround View on the infotainment
display when the camera view is
active.

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Driving and Operating 269
6. Guidance Lines/Hitch Guidance
Guidance Lines displays available
guidelines, including Standard and
Hitch Guidance. A grayed-out icon
indicates that guidelines are not
available. To enable, touch Guidance
Lines on the infotainment display
when a camera view is active.
Touching the button multiple times
will toggle through Standard
Guidelines, Hitch Guidance and no
guidelines. Standard guidelines are
available in Front/Rear Standard
Views, Front/Rear Top-Down Views
and Surround View.
Hitch Guidance displays a single
centered guideline on the
infotainment display to assist with
aligning the vehicle’s hitch ball with a
trailer coupler. Touch the Hitch
Guidance icon, then align the trailer
guidance line over the trailer coupler.
Continuously steer the vehicle to keep
the guideline centered on the coupler
when backing. Park Assist overlays will
not display when the trailer guidance
line is active. Hitch Guidance is
available in Rear Standard View.{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.
7. Interior Trailer View
Provides a view of the interior of the
trailer. The feature is available when a
trailer is connected. The feature
requires user installation of an
accessory trailer camera on the
interior of the trailer per the accessory
trailer camera installation instructions
(see your dealer for accessory trailer
camera(s) and information). To select,
touch Interior Trailer View on the
infotainment display when a camera
view is active. To access this view
when in a forward gear above
12 km/h (8 mph), touch CAMERA on
the infotainment display and touchthe Interior Trailer View icon. The view
will close after 8 seconds and can be
closed early by touching X.
8. Hitch View
Assists with connecting to a trailer by
providing a zoomed-in view of the
hitch to help align the vehicle’s hitch
ball with the trailer coupler, or to
monitor the trailer connection. To
select, touch Hitch View on the
infotainment display when a camera
view is active. To access this view
when in a forward gear above
12 km/h (8 mph), touch CAMERA on
the infotainment display and touch
the Cargo Bed View icon. The view
will close after 8 seconds and can be
closed early by touching X. Shifting
into P (Park) while in this view will
automatically engage the Electric
Parking Brake (EPB).
9. Bed View
Provides a view of the truck bed and
the area behind the vehicle to assist
in cargo or hitch monitoring or
hitching to a fifth wheel or gooseneck
trailer. To select, touch Bed View on
the infotainment display when a
camera view is active. To access this
view when in a forward gear above

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
270 Driving and Operating
12 km/h (8 mph), touch CAMERA on
the infotainment display and touch
the Bed View icon. The view will close
after 8 seconds and can be closed
early by touching X.
10. Transparent Trailer View
Provides a view that allows the driver
to virtually“see through” the trailer.
The feature is available when a
compatible trailer is connected and a
profile is configured and selected via
the Trailering App. See Trailering App
0 307. The feature requires user
installation of 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 select,
touch Transparent Trailer View on the
infotainment display when a camera
view is active. To access this view
when in a forward gear above
12 km/h (8 mph), touch CAMERA on
the infotainment display and touch
the Transparent Trailer View icon.
Touch X to exit.
When the system is calibrated and the
trailer position is known, one of three
views will be shown; Transparent Trailer View, Left Transparent Trailer
View or Right Transparent Trailer
View. The Transparent Trailer View is
shown when the position of the trailer
is relatively straight behind the
vehicle. The Left or Right Transparent
Trailer View is shown when the
position of the trailer is too far to the
left or right. When the system is not
calibrated or trailer position is not
known the Transparent Trailer
Picture-in-Picture View will be shown.
11. Rear Trailer View/Rear Side View with
Available Articulation Functionality/
Picture-in-Picture Side View
.Rear Trailer View provides a view
of the area behind the trailer. the
feature is available when a trailer
is connected. The feature requires
user installation of 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
select, touch Rear Trailer View/Rear
Side View with Available
Articulation Functionality/
Picture-in-Pictue Side View on the infotainment display when a
camera view is active. Each touch
will toggle through the Rear Trailer
View, Trailer Tow Mirror View and
Combo View. To access this view
when in a forward gear above
12 km/h (8 mph), touch CAMERA
on the infotainment display and
touch the Interior Rear Trailer
View/Rear Side View with Available
Articulation Functionality/
Picture-in-Picture Side View icon.
Touch X to exit.
.Rear Side View with Available
Articulation Functionality provides
a rearward split view of the left
and right sides of the vehicle and
trailer. When in a forward gear the
view well automatically pan to
show more of the left or right side
based on the position of the
trailer. The feature is available
when a trailer is connected. To
select, touch Rear trailer View/Rear
Side View with Available
Articulation Functionality/
Picture-in-Picture Side View on the
infotainment display when a
camera view is active. Each touch
will toggle through the Rear Trailer

GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Driving and Operating 271
View, trailer tow Mirror view and
Combo View. To access this view
when in a forward gear above
12 km/h (8 mph), Touch CAMERA
on the infotainment display and
touch the Rear Trailer View/Rear
Side View with Available
Articulation Functionality/
Picture-in-Picture Side icon. Touch X
to exit.
.Provides a rearward split view of
the left and right sides of the
vehicle and trailer with an overlay
view of the area behind the trailer.
The feature is available when a
trailer is connected. the feature
requires user installation of 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
select, touch Rear Trailer View/Rear
Side View with Available
Articulation Functionality/
Picture-in-Picture Side view on the
infotainment display when a
camera view is active. Each press
of the button will toggle throughthe Rear Trailer View, Trailer Tow
mirror View and Combo View. To
access this view when in a forward
gear above 12 km/h (8 mph), touch
CAMERA on the infotainment
display and touch the Rear Trailer
View/Rear Side View with Available
Articulation Functionality/
Picture-in-Picture Side View icon.
Touch X to exit.
HD Surround Vision with Trailer Camera
Provisions
If equipped, this feature provides additional
views to aid in trailering/towing. The
system shows multiple views in the
infotainment display using five cameras
mounted around the vehicle and up to two
additional accessory cameras that can be
mounted on or in a trailer. The front camera
is in the grille under the front emblem, the
side cameras are on the bottom of the
outside mirrors, the rear camera is in the
tailgate handle and the bed camera is
mounted on the rear of the cab.
Additionally, up to two accessory cameras
can be mounted to the rear and/or interior
of the trailer. See your dealer for accessory
trailer cameras. To access, touch CAMERA on
the infotainment display or shift to R (Reverse). To return to the previous screen
when not in reverse, touch the Home or
Back buttons on the infotainment display.
Certain trailer views require a compatible
trailer profile be configured and selected.
A compatible trailer is a box type trailer
(cargo, camper, etc.) with a conventional
hitch.
Available camera views:.Front/Rear Standard View
.Front/Rear Top-Down View
.Rear Bowl View
.Front/Rear Side View
.Hitch View
.Bed View
.Rear trailer View
.Rear Side view with a available
articulation functionality
.Picture-in-Picture Side View
.Interior Trailer View
.Transparent trailer View
.Surround View
.Guidance Lines
.Hitch Guidance