84 - Mismatched VIN

MISMATCHED VIN-84
For a complete wiring diagram, refer to Wiring Diagram Information.

When Monitored
Ignition on.

Set Condition
This DTC will set if the current VIN does not match the broadcast VIN from the PCM within 10 seconds.

Possible Causes
- COMMUNICATIONS DTC(S) PRESENT
- POWERTRAIN CONTROL MODULE
- ANTI-LOCK BRAKE MODULE

Diagnostic Test
1. DTC IS ACTIVE
Turn the ignition on.
With the DRBIII (R) erase DTCs.
Turn the ignition off.
Turn the ignition on.
Wait ten seconds.
With the DRBIII (R) read DTCs.

Does the DTC reset?
Yes >> Go To 2
No >> Go To 3

2. WRONG VIN PROGRAMMED IN PCM
Turn the ignition on.
With the DRBIII (R) read the VIN in the PCM.
Compare VIN in the PCM to the vehicle VIN.

Is the correct VIN programmed in the PCM?
Yes >> Replace the Antilock Brake Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Replace the Powertrain Control Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

3. COMMUNICATION DTCS PRESENT
Turn the ignition off.
With the DRBIII (R) read DTCs in all other modules. If any communications DTCs are present, refer to the appropriate diagnostic procedure.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?
Yes >> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Test Complete.