GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 406

4. Reapply the brake pedal. Then apply the parking
brake and shift into P (Park).
5. If the vehicle is four-wheel-drive, be sure the
transfer case is in a drive gear and not in
N (Neutral).
6. Release the brake pedal.
CAUTION:
{
It can be 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.
If the engine has been left running, the vehicle can
move suddenly. You or others could be injured.
To be sure the vehicle will not move, even when
on fairly level ground, use the steps that follow.
4-80
CAUTION: (Continued)
CAUTION: (Continued)
Always put the shift lever fully in P (Park) with the
parking brake firmly set.
If the transfer case on a four-wheel-drive vehicle is
in N (Neutral), the vehicle will be free to roll, even
if the shift lever is in P (Park). Be sure the transfer
case is in a drive gear — not in N (Neutral).
Leaving After Parking on a Hill
1. Apply and hold the brake pedal while you:
•
Start the engine
•
Shift into a gear
•
Release the parking brake
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and store the
chocks.