GM Service Manual Online
For 1990-2009 cars only

Condition

Causes

The lock system does not unlock.

    • A collapsed shear flange on the sector shaft
    • A damaged lock bolt
    • A damaged lock cylinder
    • A damaged housing
    • A damaged sector or rack
    • A damaged actuator rod
    • A damaged ignition switch
    • A damaged or incorrect key cut
    • A shift lever not in the PARK position
    • A park lock cable incorrectly adjusted
    • Damaged park lock components