GM Service Manual Online
For 1990-2009 cars only

Problem

Action

The transmission does not shift out of PARK with the brake pedal depressed and the ignition switch in the RUN position.

Refer to Automatic Transmission Shift Lock Control Inoperative

The transmission shifts out of the PARK position with the ignition switch in the RUN position and the brake pedal not depressed.

Refer to Automatic Transmission Shift Lock Control Always On With Ignition in RUN