Diagnostic Aids
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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 the Theft Deterrent Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Theft Deterrent |
| 2 | Is DTC B2721, B2722, B2723 or B2735 set as a current code? | Go to Diagnostic Trouble Code (DTC) List | Go to Step 3 |
| 3 | Perform the Programming Theft Deterrent System Components procedure. Refer to Programming Theft Deterrent System Components . Did you complete the action? |
Go to Step 4 | - |
| 4 |
|
Go to Step 2 | System OK |