Totally Integrated Power Module (TIPM)

U0101-LOST COMMUNICATION WITH TCM

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

- When Monitored:
With the ignition on.

Battery voltage between 10 and 16 volts.

Ignition Off Draw (IOD) fused installed.

Totally Integrated Power Module (TIPM) is configured correctly.

- Set Condition:
Bus messages not received from the Transmission Control Module (TCM) for approximately 500 ms.





Diagnostic Test

1. VERIFY DIAGNOSTIC TROUBLE CODE (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 and 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
- Go to and perform the appropriate diagnostic procedure.

No
- Go To 3

3. VERIFY THE TCM IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, view all the modules.
3. Verify 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 and perform the appropriate No Response from TCM diagnostic procedure.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, select view all the modules.

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

Yes
- Replace/update the TCM.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No
- Replace/update the module that set this DTC.
- Perform the appropriate verification test.