1000 - 1999: 1028

1028 - TCM NOT IDENTIFIED OR INCORRECT





When Monitored and Set Condition

- When Monitored: Continuous.
- Set Condition: If the Controller Antilock Brake (CAB) cannot recognize the Transmission Control Module (TCM) message, the DTC is set.





For a complete Antilock Brake System (ABS) Circuit Diagram Brakes - ABS Electrical Diagnostics.

Diagnostic Test

1. WITH THE SCAN TOOL, READ DTCs
Turn the ignition on.
With the scan tool, erase DTCs.
Turn the ignition off.
Turn the ignition on.
Start the engine.

CAUTION: Ensure braking capability is available before road testing.

Drive the vehicle above 16 km/h (10 MPH) for at least 20 seconds.
Stop the vehicle.
With the scan tool, read DTCs.
Does the scan tool display a TCM Not Identified or Incorrect DTC?

Yes

- Replace the Controller Antilock Brake (CAB) Module. Removal.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- The condition that caused this DTC to set is currently not present.
- Perform ABS VERIFICATION TEST. ABS Verification Test