GM Service Manual Online
For 1990-2009 cars only

Shifting Out of Park Automatic Transmission

Your vehicle has an automatic transmission shift lock control system. You have to fully apply your regular brakes before you can shift from PARK (P) when the ignition is in ON. See Automatic Transmission Operation for more information.

If you cannot shift out of PARK (P), release the button on the shift lever and ease the pressure on the shift lever. Push the shift lever all the way into PARK (P) while pushing the button on the shift lever as you maintain brake application. Then move the shift lever into the desired gear.