Antilock Brake Module (ABS)

U0101-00-LOST COMMUNICATION WITH TCM

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

- When Monitored:

- Ignition on, battery voltage between 9 and 16 volts.
- Set Condition:
If the Anti-Lock Brakes System (ABS) Module fails to receive bus messages from the Powertrain Control Module (PCM) transmission for approximately 500 ms.





NOTE: If present, diagnose and repair DTC U0002-88-CAN C BUS OFF PERFORMANCE - BUS OFF before diagnosing this DTC.

1. VERIFY THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read and record ABS DTCs.
3. With the scan tool, read and record Environmental Data (EV Data).
4. With the scan tool, erase ABS DTCs.
5. Cycle the ignition switch.
6. With the scan tool, read ABS DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Perform the Stored Lost Communication DTCs diagnostic procedure. Stored Lost Communication DTCs.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
1. With the scan tool, read all active DTCs from all CAN C Bus modules.

NOTE: Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs related to the conditions listed above?

Yes

- Diagnose and repair the DTCs.

No

- Go To 3

3. VERIFY THAT THE PCM IS ACTIVE ON THE BUS
1. With the scan tool, select ECU View.
2. Verify that the PCM is active on the bus.

Is the PCM active on the bus?

Yes

- Go To 4

No

- Perform the Stored Lost Communication DTCs diagnostic procedure. Stored Lost Communication DTCs.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs
1. With the scan tool, select Network View and select Advanced.

Is there more than one module with active DTCs "Logged Against" the TCM?

Yes

- Replace/update the Powertrain Control Module (PCM). Powertrain Control Module - Removal
- Perform the PCM VERIFICATION TEST. Powertrain Verification Test

No

- Replace the Anti-lock Brake System (ABS) Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.