The brake transmission shift interlock (BTSI) system is damaged.

Repair or replace the BTSI as needed. Refer to Automatic Transmission Shift Lock Control Disassemble - Off Vehicle or Automatic Transmission Shift Lock Control Assemble - Off Vehicle .

The lock cylinder housing assembly is damaged.

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

The shaft assembly is damaged.

Replace the shaft assembly. Refer to the appropriate procedure from the following list:

The ignition switch assembly is damaged.

Replace the ignition switch assembly. Refer to Ignition and Key Alarm Switch Assembly - Assemble - Off Vehicle .

The shaft linkage adjustment is improper.

Adjust the shaft linkage adjustment. Refer to Shift Cable Adjustment in Automatic Transmission.

The rack preload spring is broken or weak.

Replace the rack preload spring.

The park lock cable is not adjusted properly.

Adjust the park lock cable. Refer to Park Brake Cable Service/Adjustment .

The key is incorrect, bent, or twisted.

Replace the key. Refer to Key and Lock Cylinder Coding in General Information.

The rack is bent or broken.

Replace the rack.