GMC 2012 Sierra Series Owner's Manual page 322

9-38 Driving and Operating
There are several different positions
for the shift lever.
®
Hydra-Matic 4-Speed Automatic
Transmission
Heavy Duty 6-Speed Automatic
Transmission Shown (Light Duty
6 Speed Similar)
See Range Selection Mode under
Manual Mode on page 9 41.
P (Park): This position locks the
rear wheels. It is the best position to
use 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 on page 9 33 for
more information.
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.
Do not leave the vehicle when the
engine is running unless you
have to. 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,
(Continued)
I n f o r ma t i o n P r o v i d e d b y :
WARNING (Continued)
always set the parking brake and
move the shift lever to P (Park).
See Shifting Into Park on
page 9 33. If you are pulling a
trailer, see Driving Characteristics
and Towing Tips on page 9 80.
WARNING
If you have Four-Wheel Drive, the
vehicle will be free to roll
if the shift lever is in P (Park)
the transfer case is in Neutral. So,
be sure the transfer case is in a
drive gear, Two-Wheel Drive High
or Four-Wheel Drive High or
Four-Wheel Drive Low
Neutral. See Shifting Into Park
on page 9 33.
even
if
not in