Code 53, Anti-Theft System (5.0L F Body): Notes

Vehicle Anti-Theft System (VATS) is designed to disable vehicle operation if incorrect key or starting procedure is used. Decoder module sends a signal to the ECM if the correct key is being used. If the proper signal does not reach the ECM, ECM will not pulse injectors. Code will set if the ECM has not received the proper signal and the ignition switch has been turned on. Code 53 does not store in ECM memory but is only present when the condition is current.