2012 Buick Enclave Owner's Manual - Page 277

Driving and Operating If you have to leave the vehicle with the engine running, be sure the vehicle is in P (Park) and the parking brake is firmly set before you leave it. After you have moved the shift lever into P (Park), hold the regular brake pedal down. Then, see if you can move the shift lever away from P (Park) without first pushing the button. If you can, it means that the shift lever was not fully locked in P (Park). 9-23 Torque Lock Torque lock is when the weight of the vehicle puts too much force on the parking pawl in the transmission. This happens when parking on a hill and shifting the transmission into P (Park) is not done properly and then it is difficult to shift out of P (Park). To prevent torque lock, set the parking brake and then shift into P (Park). To find out how, see "Shifting Into Park" listed previously. If torque lock does occur, your vehicle may need to be pushed uphill by another vehicle to relieve the parking pawl pressure, so you can shift out of P (Park). Shifting out of Park The vehicle is equipped with an electronic shift lock release system. The shift lock release is designed to: . Prevent ignition key removal unless the shift lever is in P (Park) with the shift lever button fully released, and Prevent movement of the shift lever out of P (Park), unless the ignition is in ON/RUN or ACC/ACCESSORY and the regular brake pedal is applied. . The shift lock release is always functional except in the case of an uncharged or low voltage (less than 9‐volt) battery.