GMC Sierra 2023 Manual page 87

86 Driving and Operating
See your owner s manual and Range
Selection Mode under Manual Mode
(Mechanical Shifter) 0 92 or
Manual Mode (Electronic Shifter) 0 94.
P : This position locks the rear wheels. Use
P (Park) when starting the engine because
the vehicle cannot move easily.
When parked on a hill, especially when the
vehicle has a heavy load, you might notice
an increase in the effort to shift out of
P (Park). See Torque Lock under Shifting
Into Park (Mechanical Shifter) 0 81 or
Shifting Into Park (Electronic Shifter) 0 82.
Warning
It is dangerous to get out of the vehicle
if the shift lever is not fully in P (Park)
with the parking brake firmly set. The
vehicle can roll.
Warning (Continued)
Do not leave the vehicle when the engine
is running. If you have left the engine
running, the vehicle can move suddenly.
You or others could be injured. To be
sure the vehicle will not move, even
when you are on fairly level ground,
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.
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.
(Continued)
R : Use this gear to back up.
Warning
2 , 4 ,
Caution
Shifting to R (Reverse) while the vehicle is
moving forward could damage the
transmission. The repairs would not be
covered by the vehicle warranty. Shift to
R (Reverse) only after the vehicle is
stopped.
To rock the vehicle back and forth to get
out of snow, ice, or sand without damaging
the transmission, see your owner s manual.
N : In this position, the engine does not
connect with the wheels. To restart the
engine when the vehicle is already moving,
use N (Neutral) only.
Warning
Shifting into a drive gear while the
engine is running at high speed is
dangerous. Unless your foot is firmly on
the brake pedal, the vehicle could move
very rapidly. You could lose control and
hit people or objects. Do not shift into a
drive gear while the engine is running at
high speed.