The vehicle theft deterrent (VTD) module is located within the steering column. If the VTD module has been replaced, the password must be relearned using approved Techline diagnostic equipment. If the powertrain control module (PCM) is replaced, the replacement PCM should learn the password within a few seconds after the ignition is turned ON. DTC P1630 is an information code indicating that the PCM is ready to learn the VTD password. The engine will start and continue to run with DTC P1630 set. Refer to Vehicle Theft Deterrent (VTD) Description in Theft Deterrent for further information regarding the VTD system.

The PCM remains in theft deterrent password learn mode for more than 2 seconds.

The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

A new replacement PCM will be in a functional state to learn the password from the VTD module. If the VTD module is replaced, the PCM must be placed in password learning mode to relearn a new password. Once learned, the password becomes permanent information that remains with the vehicle. The loss of PCM battery or ignition voltage will not affect the programmed password information.

Refer to Programming Theft Deterrent System Components for information concerning the password learning procedure.