GMC Sierra 2023 Manual page 90

Warning (Continued)
always set the parking brake and move
the shift lever to P (Park). See Shifting
Into Park (Mechanical Shifter) 0 81 or
Shifting Into Park (Electronic Shifter) 0 82
and your owner s manual.
Warning
If equipped with four-wheel drive, the
vehicle will be free to roll if the transfer
case is in N (Neutral), even when the shift
lever is in P (Park). You or someone else
could be seriously injured. Be sure the
transfer case is in a drive gear
or 4 or set the parking brake before
placing the transfer case in N (Neutral).
See Four-Wheel Drive 0 95.
This vehicle is equipped with an
electronically controlled transmission. The
shift lock release button is designed to
prevent inadvertent shifting out of P (Park)
2 , 4 ,
unless the ignition is on, the brake pedal is
applied, and the shift lock release button is
pressed.
When the vehicle is stopped, press ENGINE
START/STOP to turn off the vehicle. The
transmission will shift to P (Park)
automatically unless the vehicle is in
N (Neutral), See Car Wash Mode later in
this section.
The vehicle will not shift into P (Park) if it is
moving too fast. Stop the vehicle and shift
into P (Park).
Driving and Operating
To shift in and out of P (Park), see Shifting
Into Park (Mechanical Shifter) 0 81 or
Shifting Into Park (Electronic Shifter) 0 82
and Shifting out of Park (Mechanical Shifter)
0 83 or Shifting out of Park (Electronic
Shifter) 0 84.
Service Shift Lever Message
If the message SERVICE SHIFTER SEE
OWNER S MANUAL appears in the Driver
Information Center (DIC), the shift lever
needs service. Have the vehicle serviced as
soon as possible. If the vehicle is
automatically shifting into P (Park), check to
see if the P (Park) button on top of the shift
lever is stuck. To operate the vehicle, hold
the shift lever in the desired gear,
R (Reverse) or D (Drive), until vehicle speed
exceeds 15 km/h (10 mph), then release the
shift lever.
R : Use this gear to back up.
If the vehicle is shifted from either
R (Reverse) to D (Drive) or L (Low), or L (Low)
or D (Drive) to R (Reverse) while the speed is
too high, the vehicle may shift to
N (Neutral). Reduce the vehicle speed and
try the shift again.
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