GM Service Manual Online
For 1990-2009 cars only

Condition

Action

A burr is on the tang of the shift gate.

Remove the burr.

The lock module gear train is jammed.

Replace the lock module. Refer to Electronic Column Lock Module - Disassemble - Off Vehicle or Electronic Column Lock Module - Assemble - Off Vehicle .

None of the above conditions have occurred.

Replace the lock cylinder. Refer to Ignition Lock Cylinder Replacement - On Vehicle .