U1120

U1120-LOST WHEEL DISTANCE MESSAGE





For a complete wiring diagram, refer to the Wiring Information.

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. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
1. Ignition on, engine not running.
2. 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 Test

2. U0121-LOST COMMUNICATION WITH ABS MODULE/P0141-LOST COMMUNICATION WITH FCM (TIPM) ALSO SET
1. 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. Testing and Inspection.Perform the POWERTRAIN VERIFICATION TEST.Powertrain Verification Test.

No

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