Antilock Brake Module (ABS)

U0101-LOST COMMUNICATION WITH TCM



- When Monitored:

- With the ignition on
- Battery voltage between 10 and 16 volts
- Ignition Off Draw (IOD) fused installed.
- Set Condition:
If the Anti-Lock Brake Module fails to receive bus messages from the Transmission Control Module (TCM) for approximately 500 ms.





1. VERIFY DTC IS ACTIVE

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

1. Turn the ignition on.
2. With the scan tool, read and record ABS DTCs.
3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase ABS DTCs.
5. Cycle the ignition switch.
6. With the scan tool, read ABS DTCs.

Does this DTC reset?

Yes

- Go To 2

No

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

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

NOTE: Check for TIPM configuration, CAN B or 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

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 3

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

Is the TCM active on the bus?

Yes

- Go To 4

No

- No Response From TCM (Transmission Control Module) - NAG1 Perform the No Response from TCM diagnostic procedure.

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 TCM.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test.

No

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