2021 GMC SIERRA change time

4F Optional equipment
KEYLESS ACCESS SYSTEMF
REMOTE KEYLESS ENTRY TRANSMITTER (KEY FOB)F
The Keyless Access System enables operation of the doors and tailgate without removing the Remote Keyless Entry transmitter (key fob) from your pocket or purse.
The key fob must be within 3 feet of the tailgate or the door being unlocked.
KEYLESS UNLOCKING
With the key fob within range:
Press the button on the driver’s door
handle to unlock the driver’s door; press
again within 5 seconds to unlock all
doors and tailgate.
Press the button on a passenger door handle to unlock all doors and tailgate.
Press the lower button on the tailgate to lower the standard tailgate.
KEYLESS LOCKING
With the ignition off, the key fob removed from the vehicle, and all doors closed:
Press the button on any door handle to lock all doors and tailgate immediately.
If Passive Locking is turned on in the Settings menu, all doors will lock automatically after a short delay.
Note: To change the door lock and unlock settings, go to Settings > Vehicle > Remote Lock,
Unlock, Start.
See Keys, Doors and Windows in your Owner’s Manual.
Lock
Press to lock all doors
and tailgate.
Unlock
Press to unlock the
driver’s door or all doors
and tailgate.
Remote Windows F

Press and hold the
Unlock button until the
windows are fully open. To enable, select
the Settings menu on the infotainment
screen. Go to Settings > Vehicle > Remote
Lock, Unlock, Start.
Remote Mirrors F
Press and hold the Lock/Unlock button
for 1 second to fold/unfold the power
mirrors. To enable, go to Settings > Vehicle > Comfort and Convenience.
Vehicle Locator/Panic Alarm
Press and release to locate your vehicle.
The exterior lamps flash and the horn
chirps 3 times
Press and hold to activate the alarm.
Press again to cancel the alarm.
Power Release Tailgate F

Press twice to lower the tailgate.
Remote Vehicle StartF
Press and release the
Lock button and then press and hold the button until the turn signal lamps flash to start
the engine from outside the vehicle. After
entering the vehicle, turn on the ignition.
To cancel a remote start, press and hold
the button until the parking lamps turn off.
See Keys, Doors and Windows in your Owner’s Manual.

14F Optional equipment
DRIVER ASSISTANCE SYSTEMSF
Safety or driver assistance features are not a substitute for the driver’s responsibility to operate
the vehicle in a safe manner. The driver should remain attentive to traffic, surroundings and
road conditions at all times. Read your Owner’s Manual for important feature limitations and
information.
SAFETY ALERT SEAT – The driver’s seat pulses — left side, right side or simultaneously
— to alert the driver of the direction of potential hazards.
Audible alerts or seat pulsing alerts may be selected. To change the alert settings, go to Settings > Vehicle > Collision/Detection Systems > Alert Type.
FORWARD COLLISION ALERT – The Vehicle Ahead Indicator is green when a vehicle is detected and is amber when following a vehicl e ahead much too closely. When approaching a vehicle directly ahead too rapidly, a red alert flashes on the windshield
and the Safety Alert Seat pulses or rapid beeps sound (if selected).
Press the Forward Collision Alert button on the steering wheel to set the alert
timing to Far, Medium, or Near.
FOLLOWING DISTANCE INDICATOR – The
following distance to the vehicle ahead is
indicated in seconds under the Info menu
on the Driver Information Center. If no vehicle is detected ahead, dashes are displayed.
AUTOMATIC EMERGENCY BRAKING – In
detected potential imminent collision situ -
ations with vehicles directly ahead, the
system can provide alerts and enhance driver braking or automatically apply hard emergency braking, if you have not already
done so, to help reduce the severity or help avoid collisions at very low speeds.
To set Automatic Emergency Braking and Forward Collision Alert to Alert and Brake,
Alert, or Off, go to Settings > Vehicle > Collision/Detection Systems > Forward
Collision System
FRONT PEDESTRIAN BRAKING – During daytime driving, the system can detect pedes -
trians directly ahead up to a distance of approximately 131 ft. and displays an amber
indicator. When approaching a detected pedestrian too quickly, a red alert flashes on the windshield and the Safety Alert Seat pulses or rapid beeps sound (if selected). The system may enhance driver braking or automatically apply hard emergency braking, if you have not already done so.
To set to Alert and Brake, Alert, or Off, go to Settings > Vehicle > Collision/Detection
Systems > Front Pedestrian Detection.
LANE CHANGE ALERT WITH SIDE BLIND ZONE ALERT – While driving, the system displays a warning symbol on the left or right side mirror when a moving vehicle
is detected rapidly approaching or in a side blind zone. The warning symbol flashes if a
turn signal is activated when a vehicle has been detected on the same side.
To turn on or off, go to Settings > Vehicle > Collision/Detection Systems > Lane
Change Alert.
See Driving and Operating in your Owner’s Manual.

20
Download the myGMC app to your compatible smartphone (or device) and, if your vehicle is properly equipped, you can start or turn off your engine, lock or unlock your doors, view key diagnostic information, set parking information and more.
The app is available on select Apple and Android devices. Service availability, features and functionality vary by vehicle, device and data plan. Device data connection
required. Visit onstar.com for more details. Download the mobile app from your
compatible mobile device’s app store.
ROADSIDE ASSISTANCE
1-888-881-3302 TTY Users: 1-888-889-2438
As the owner of a new GMC, you are automatically enrolled in the GMC Roadside
Assistance program for up to 5 years/60,000 miles, whichever occurs first, at no
expense to you. GMC’s Roadside Assistance toll-free number is staffed by a team of
trained advisors who are available 24 hours a day, 365 days a year, to contact a service
provider for light services (fuel delivery, jump-starts, flat tire and lock-outs) or make
arrangements to tow your vehicle to the nearest GMC dealer for any repairs.
ONSTAR® ROADSIDE ASSISTANCE
If you have a current OnStar Safety & Security plan, push the blue OnStar button or red
Emergency button to get the help you need. An OnStar advisor will use GPS technology
to pinpoint your vehicle location and contact the nearest service provider.
To learn more about OnStar services, push the blue OnStar button, visit onstar.com, call
1-888-4-ONSTAR (1-888-466-7827), or refer to your Owner’s Manual.
GMC OWNER CENTER
Get to know your vehicle inside and out with the GMC Owner Center. Check out person -
alized information, including an online Owner’s Manual and helpful how-to videos, track
your service history and warranty status, manage your OnStar and Connected Services
vehicle plans, review your current Vehicle Diagnostics report (active service required)
and more. Create an account today at my.gmc.com.
MYGMC MOBILE APP
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We recommend always using ACDelco or GM Genuine Parts
Certain restrictions, precautions and safety procedures apply to your vehicle. Please read your Owner’s Manual
for complete instructions. All information contained in this guide is based on the latest information available at
the time of printing and is subject to change without notice. Copyright 2020 General Motors. All rights reserved.