tow GMC SIERRA 2020 Get To Know Guide

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REAR SEATSF
POWER MIRRORSF/TRAILER-TOW MIRRORSF
REAR SEAT STORAGE
Seatback storage is an ideal location for charge cords, tablets, flashlights or rain gear.
Pull the tab (A) to access the storage compartment in the outboard seat-backs.
Lift up either side of the 60/40-split rear seat to access the storage areas under the seat.See Storage in your Owner’s Manual.
POWER MIRROR ADJUSTMENT
Press the Mirror Selector button to select the driver or passenger side
mirror; use the four-way control pad to adjust the mirror.
POWER FOLDING MIRROR
Press the Folding Mirror button to fold or unfold the mirrors.
TRAILER-TOW MIRRORS
The trailer-tow mirrors can be extended for better visibility when towing a trailer. The lower wide-field view mirror adjusts manually.
MANUAL EXTENSIONF
To extend the manual mirror, grasp the mirror housing and pull back and rear-ward in one motion. The housing extends on a curved arc. Push in the housing to return the mirror to its original position.
POWER EXTENSIONF (HD MODEL)
Press the Power Extend button to extend or retract the power mirror.
Note: Reset the power mirrors if they are adjusted manually by using the power controls to fold/unfold or extend/retract the mirrors to their normal position.
See Keys, Doors and Windows in your Owner’s Manual.
REAR SEAT REMINDER
A Rear Seat Reminder message may display on the Driver Information Center when the vehicle is turned off. Check the rear seat before exiting the vehicle. The system does not actually detect people or items in the rear seat; instead, under certain conditions, it detects when a rear door has been opened, indicating that there may be something in the rear seat. See Seats and Restraints in your Owner’s Manual.
F Optional equipment
A

20F Optional equipment
HILL DESCENT CONTROLF
PARK GRADE HOLD ASSIST
Hill Descent Control sets and maintains vehicle speed from 1–14 mph while descending a steep incline in a forward or reverse gear.
1. Press the Hill Descent Control button on the center of the instrument panel. Vehicle speed must be below 31 mph to enable the system. The Hill Descent Control symbol will illuminate on the instrument cluster.
2. Increase or decrease speed by applying the accelerator or brake pedal or use the Cruise Control +/– buttons on the steering wheel. The adjusted speed becomes the new set speed. The symbol flashes when the system is actively applying the brakes to maintain vehicle speed.
See Driving and Operating in your Owner’s Manual.
Park Grade Hold Assist enhances hill hold by using braking effort at all four wheels to help keep the truck in place for an extended length of time.
See Driving and Operating in your Owner’s Manual.
Use the four-wheel drive buttons on the left side of the instrument panel to shift into and out of four-wheel drive. The Driver Information Center displays the current status of the transfer case.
AUTO Auto Four-Wheel Drive High – Use when traction conditions vary. Shift into this mode at any speed except when shifting from
4
4
2
.
44
2
Two-Wheel Drive High – Use for most streets and highways. Shift into this mode at any speed except when shifting from
44
2
.
4
4
2
Four-Wheel Drive High – Use when extra traction is needed or in most off-road driving. Shift into this mode at any speed except when shifting from
44
2
.
44
2
Four-Wheel Drive LowF – Use when driving off-road in deep sand, mud or snow, or on steep hills. Shift into or out of this mode when the vehicle is stopped or moving less than 3 mph with the transmission in Neutral. Shift the transmission into gear when the indicator light stops flashing.
N NeutralF – Use to dolly or dinghy tow the vehicle behind an RV. Neutral is not avail-able with the single speed transfer case. Refer to your Owner’s Manual for the shift procedure.
See Driving and Operating in your Owner’s Manual.
FOUR-WHEEL DRIVEF

21F Optional equipment
The Drive Modes automatically adjust various vehicle control systems based on driving preferences, weather and road conditions. The modes are displayed on the Driver Information Center.
Rotate the Drive Mode knob to the right to select a mode. Modes may include:
Normal – Use for normal driving.
Sport – Use for enhanced respon-siveness on paved roads.
Snow (2WD only) – Use for enhanced traction during slippery conditions.
Off-Road (4WD only) – Use for enhanced control on unpaved roads or trails at moderate speeds.
Tow/Haul – Rotate the knob to the left; use to reduce shift cycling when towing or hauling heavy loads in stop-and-go traffic, rolling hills, or busy parking lots.
Terrain (4WD only) – Press the button for enhanced control in low-speed off-road conditions. The system automatically brakes the vehicle when travers-ing various terrain or obstacles. Only available with single-speed transfer cases (LD Model) when in4
4
2
. Refer to Driver Mode Control in your Owner’s Manual.
See Driving and Operating in your Owner’s Manual.
DRIVE MODESF
LD Model shown
TIRE PRESSURE MONITOR
The Low Tire Pressure warning light on the instrument cluster illuminates when one or more of the vehicle’s tires is significantly underinflated. Fill the tires to the proper tire pressures listed on the Tire and Loading Information label, located below the driver’s door latch. Current tire pressures can be viewed on the Driver Information Center.
With the ignition On or in Accessory mode, the Tire Fill Alert will provide visual and
audible alerts when the Low Tire Pressure warning light is on to help with inflating a tire to the recommended tire pressure (does not apply to spare tire). When the recom-mended pressure is reached, the horn sounds and the turn signals change from flashing to solid.
See Vehicle Care in your Owner’s Manual.

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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 genuine GM service 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 2019 General Motors. All rights reserved.