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 Volts and 16 Volts.
- Ignition Off Draw (IOD) fuse installed.
- Front Control Module (FCM) is configured correctly.
- Set Condition:
Bus messages not received from the TCM for approximately 500ms.





WARNING: On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury

1. VERIFY DTC IS ACTIVE

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

1. With the scan tool, read DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Perform the Stored Lost Communication 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

- Front Control Module (FCM) Perform the U0101-Lost Communication with TCM diagnostic procedure.
- Perform BODY VERIFICATION TEST Body Verification Test

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

- Manufacturer Code Charts for No Response diagnostic procedures.

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 BODY VERIFICATION TEST Body Verification Test.

No

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