2020 GMC SIERRA transmission

5
STARTING THE VEHICLE
With the vehicle in Park or Neutral, rotate the key clockwise to the Start position.
TURNING OFF THE VEHICLE
Shift to Park.
Push the key all the way in (1) and then rotate the key
counter-clockwise to the Lock/Off position (2). See Driving and Operating in your Owner’s Manual.
The Remote Keyless Entry transmitter must be in the vehicle to turn on the ignition.
STARTING THE ENGINE/ON
With the transmission in Park or Neutral, press and hold the brake pedal and then press the ENGINE START/STOP button to start the engine. The green button indicator will illuminate.
Note: If the Remote Keyless Entry transmitter battery is weak, place the transmitter in the pocket in the center storage compartment (under the bench seat) or center console cupholders (bucket seats) to enable the engine to start. Replace the transmitter battery as soon as possible.
STOPPING THE ENGINE/OFF
Shift to Park and press the ENGINE START/STOP button to turn off the engine. The green button indicator will turn off.
Power will be available for 10 minutes to operate the audio system until the driver’s door is opened and to operate the windows and sunroofF until any door is opened.
ACCESSORY MODE
With the engine off and the brake pedal not depressed, press the ENGINE START/STOP button to place the ignition in accessory mode. The amber button indicator will illuminate.
See Driving and Operating in your Owner’s Manual.
F Optional equipment
KEYLESS (PUSHBUTTON) STARTF
KEYED IGNITION SYSTEM (If EquIppEd)
2
1

6F Optional equipment
STEERING WHEEL ADJUSTMENTF
With the vehicle parked, pull the lever under the steering column to adjust the steering wheel up or down and closer or farther away.F Push up the lever to lock the steering wheel in place.
See Instruments and Controls in your Owner’s Manual.
AUTO ENGINE STOP/START OPERATION (Ld ModEL)
To help conserve fuel, the auto engine stop/start system may automatically stop the engine, if operating conditions are met, when the brake pedal is pressed and the vehicle is at a complete stop. The tachom-eter gauge will read AUTO STOP. The audio system, climate controls and other acces-sories will continue to operate. When the brake pedal is released or the accelerator pedal is pressed, the engine will automati-cally restart. After parking the vehicle and turning off the engine, the tachometer gauge will read OFF.
The engine may remain running or restart when the vehicle is stopped if:
• A minimum vehicle speed is not reached.
• The engine or transmission is not at the required operating temperature.
• The outside temperature is not in the required operating range.
• The shift lever is in any gear other than Drive (D).
• The battery charge is low.
• The climate control system requires the engine to run based on the current settings.
• The Auto Stop has reached the maximum allowed time.
AUTO ENGINE STOP/START DISABLE
Press the $ button on the center of the instrument panel when the engine is run-ning to disable the auto engine stop/start system. The button indicator will turn off.
The auto engine stop/start system is enabled each time the vehicle is started.
See Driving and Operating in your Owner’s Manual.

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