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Home >> Saturn >> 2002 >> SC2 Automatic, MP6 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Theft Deterrent System -- "S" Series >> Diagnostic Information and Procedures >> DTC P1631 >> Diagnostic Aids

Diagnostic Aids

Diagnose any U-type communication or BCM passlock/BCM voltage DTCs first.

This DTC indicates the PCM received an incorrect password and may have set during the drive cycle. If the PCM detected an incorrect password during the drive cycle, the vehicle will still start.

If the PCM detected an incorrect password from the BCM during an engine crank, the engine will start then stall.

Perform the Security System (Passlock) Relearn Procedure.

Fig 1: Theft Deterrent Fuel Enable Signal Not Correct
GM874325Courtesy of GENERAL MOTORS CORP.
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