Shifting Out Of Park (P) - Buick 2007 Rainier Owner's Manual

Torque Lock
If you are parking on a hill and you do not shift your
transmission into PARK (P) properly, the weight of
the vehicle may put too much force on the parking
pawl in the transmission. 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 119.
When you are ready to drive, move the shift lever
out of PARK (P) before you release the parking
brake.
120
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 transmission, so you can pull the shift lever
out of PARK (P).

Shifting Out of Park (P)

Your vehicle has an automatic transmission shift
lock control system. You have to fully apply
the regular brakes first and then press the shift
lever button before you can shift from PARK (P)
when the ignition is in RUN. See Automatic
Transmission Operation on page 114.