Antilock Brake Module (ABS)

U0101-LOST COMMUNICATION WITH TCM

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

- When Monitored:

- With the ignition on.
- Battery voltage between 10 and 16 volts.
- Ignition Off Draw (IOD) fused installed.
- Front Control Module (FCM) is configured correctly.
- Set Condition:
Bus messages not received from the TCM for approximately 500ms.





1. VERIFY DTC IS ACTIVE

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

1. With the scan tool, read active DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Perform the Stored Lost Communication DTCs diagnostic procedure Stored Lost Communication DTCs.

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

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

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

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 3

3. VERIFY THAT THE TCM IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, select Network Diagnostics.
3. Verify that the TCM is active on the bus.

Is the TCM active on the bus?

Yes

- Go To 4

No

- Perform the Loss of Communication with TCM diagnostic procedure. Communications - Verbose Codes

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, select Network Diagnostics.

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

Yes

- Replace/update the TCM.
- Perform the TRANSMISSION VERIFICATION TEST. Verification Tests.

No

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.