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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1407 (Theft Deterrent System - Immobilizer) >> Diagnostic Information and Procedures >> DTC P1631 >> Diagnostic Aids

Diagnostic Aids

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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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