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Diagnostic Aids

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

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

DTC P1631

Step Action Yes No
1 Did you perform A Diagnostic System Check-Theft Deterrent? Go to Step 2  Go to Diagnostic System Check - Theft Deterrent 
2 Perform the Password Learn Procedure. Refer to Programming Theft Deterrent System Components .
Did you complete the procedure?		 System OK -
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