GM Service Manual Online
For 1990-2009 cars only

Caution: When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured.

  1. Before starting this check, be sure there is enough room around the vehicle.
  2. Firmly apply both the parking brake and the regular brake. See Parking Brake.
  3. Do not use the accelerator pedal, and be ready to turn off the engine immediately if it starts.

  4. Try to start the engine in each gear. The vehicle should start only in P (Park) or N (Neutral). If the vehicle starts in any other position, contact your dealer/retailer for service.