2008 GMC Envoy Owner's Manual - Page 95

Ignition Positions Use the key to turn the ignition switch to four different positions. A (LOCK/OFF): This position locks the ignition and transmission. It is a theft-deterrent feature. You will only be able to remove the key when the ignition is turned to LOCK/OFF. If the steering wheel is locked, move it from right to left and turn the key to ACC/ACCESSORY. If none of this works, then your vehicle needs service. B (ACC/ACCESSORY): This position lets you use things like the radio and the windshield wipers when the engine is off. Lengthy operation of features such as the radio in the ACC/ACCESSORY may drain the battery and prevent your vehicle from starting. Do not operate your vehicle in the ACC/ACCESSORY for a long period of time. Press the regular brake pedal, and turn the ignition to ON/RUN to shift out of PARK (P). Notice: Using a tool to force the key from the ignition switch could cause damage or break the key. Use the correct key and turn the key only with your hand. Make sure the key is all the way in. If none of this works, then your vehicle needs service. C (ON/RUN): This is the position for driving. The battery could be drained if you leave the key in the ACC/ACCESSORY or ON/RUN position with the engine off. You may not be able to start your vehicle if the battery is allowed to drain for an extended period of time. D (START): This position starts the engine. 2-21