Modern vehicles have anti-theft systems that vary according to the manufacturer but have characteristics in common. The main basis of these systems is that several control modules have to interact with each other and with the ignition key. If this communication does not exist, the injection and ignition system will not work.
In general, both the Powertrain Control Module (PCM), Body Control Module (BCM), and the PIM or Powertrain Interface Module must decode the security code of the key. Then, all these modules need to interact once again through the CAN system to verify that they have not only recognized the key but also that they have recognized each other. Once all the modules have recognized the key and also each other, the PCM enables the fuel injection and ignition system, allowing the vehicle to be started.
If a fault occurs that interferes with the interaction of the modules, the DTC code P0513 OBDII will be stored.