Shifting Out Of Park (P) - Pontiac Montana SV6 2007 Owner's Manual

After you move the shift lever into PARK (P), hold
the regular brake pedal down. Then, see if you can
move the shift lever away from PARK (P) without
first pulling it toward you. If you can, it means that
the shift lever was not fully locked into PARK (P).
Torque Lock
If you are parking on a hill and you do not shift your
vehicle into PARK (P) properly, the weight of the
vehicle may put too much force on the parking pawl
in the transaxle. You may find it difficult to pull the
shift lever out of PARK (P). This is called torque
lock. To prevent torque lock, set the parking brake
and then shift into PARK (P) properly before you
leave the driver's seat. To find out how, see Shifting
Into Park (P) on page 145.
146
When you are ready to drive, move the shift lever
out of PARK (P) before you release the parking
brake.
If torque lock does occur, you may need to
have another vehicle push yours a little uphill to
take some of the pressure from the parking pawl in
the transaxle, so you can pull the shift lever out
of PARK (P).

Shifting Out of Park (P)

Your vehicle has an automatic transaxle shift
lock control system which locks the shift lever in
PARK (P) when the ignition is in the LOCK position.
In addition, you must fully apply your regular brakes
before you can shift from PARK (P) when the
ignition is in RUN. See Automatic Transaxle
Operation on page 140.