U1120

U1120-LOST WHEEL DISTANCE MESSAGE





For a complete wiring diagram Consult Diagrams/Electrical.

Theory of Operation

The PCM receives the vehicle speed signal over the CAN C bus from the Anti-lock Brake Module.

- When Monitored:
Ignition on.

- Set Condition:
The PCM doesn't receive a wheel distance message from the Anti-lock brake Module over the CAN C bus.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. ACTIVE DTC
Ignition on, engine not running.
With the scan tool View Powertrain DTCs.
Is the DTC Active at this time?

Yes

- Go to 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition

2. U0121-LOST COMMUNICATION WITH ABS MODULE/P0141-LOST COMMUNICATION WITH FCM (TIPM) ALSO SET
With the scan tool, read the appropriate module for DTCs.
Is the U0121-LOST COMMUNICATION WITH ABS MODULE/P0141-LOST COMMUNICATION WITH FCM (TIPM) also set?

Yes

- Perform the appropriate diagnostic test.Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test