P1234

DTC P1234
Security - code fault (OBSOLETE CODE!) (Driving Cycle )

Possible causes by suggested order of priority:
- Security code fault.

Security code fault.
- Engine immobilization code fault.
- If the ECM has been changed then this fault will be logged the first time the ignition is turned on.
- If the ECM has NOT been changed there is a problem with vehicle security.