Final Drive Control Module (FDCM)

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) fuse installed.
- Totally Integrated Power Module (TIPM) is configured correctly.
- Set Condition:
Bus messages not received from the Transmission Control Module (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

- 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 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. Ignition on, engine not running.
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 No Response from TCM diagnostic procedure. No Response From TCM (Powertrain Control Module) - NGC

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 TCM VERIFICATION TEST. Verification Tests.

No

- Replace/update the module that set this DTC.
- Perform the BODY VERIFICATION TEST. Body Verification Test.