The park interlock is actuated by the brake light switch. When you hit the brakes, the switch tells the lock you have your foot on the brakes and it's safe to shift from park. The next time this happens, check to see if the brake lights are working. If not, replace the brake light switch or check it for adjustment.
Let me know if this helps.
Tuesday, January 6th, 2009 AT 10:41 PM