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Home >> Buick >> 2001 >> Century Limited >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> Anti-Theft System >> Diagnostic Tests >> DTC P1631: Theft Deterrent Start Enable Signal Not Correct >> Diagnostic Aids

Diagnostic Aids

DTC P1631 indicates that VTD password learned by PCM does not agree with password received from VTD system. This condition can occur if an incorrect key is used when attempting to start vehicle, or if BCM has been replaced and PCM password learn function has not been enabled. If BCM has been replaced, VTD password must be relearned.

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