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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1084 (Theft Deterrent System) >> Diagnostic Information and Procedures >> DTC P1631: Theft Deterrent Fuel Enable Signal Not Correct >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1631 indicates that the PCM has detected an incorrect password from the theft deterrent control module. This condition can occur if an incorrect key is being used when attempting to start the vehicle or if the theft deterrent control module has been replaced and the PCMs password learn function has not been enabled.

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