2010 GMC Acadia Owner's Manual - Page 278

9-22 Driving and Operating If you can, it means that the shift lever was not fully locked in P (Park). Shifting Out of Park The vehicle is equipped with an electronic shift lock release system. The shift lock release is designed to: . 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). The shift lock release is always functional except in the case of an uncharged or low voltage (less than 9 volt) battery. If the vehicle has an uncharged battery or a battery with low voltage, try charging or jump starting the battery. See Jump Starting on page 10‑79 for more information. To shift out of P (Park): 1. Apply the brake pedal. 2. Press the shift lever button. 3. Move the shift lever to the desired position. 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. .