The Vehicle Theft Deterrent system (VTD) is incorporated within the body control module (BCM). If the BCM 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 Content Theft Deterrent (CTD) Circuit Description and Vehicle Theft Deterrent (VTD) Operation in Theft Deterrent for further information regarding the VTD system.

The PCM remains in the Theft Deterrent Password Learn Mode for more than 2 seconds.

A new replacement PCM will be in a functional state to learn the password from the BCM. If the BCM 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 Replacement Keys, Ignition Cylinder, or Powertrain Control Module in Theft Deterrent for information concerning the password learning procedure.