Gas

U0101-LOST COMMUNICATION WITH TCM

For a complete wiring diagram refer to Diagrams/Electrical.


- When Monitored:
- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- Set Condition:

If the Powertrain Control Module fails to receive bus messages from the TCM for approximately 500 ms.







Diagnostic Test


1. VERIFY DTC IS ACTIVE

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

Turn the ignition on.

With the scan tool, select View DTCs.

Is this DTC Active?

Yes

- Go To 2

No

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

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS

With the scan tool, read all active DTCs from all CAN C Bus modules.


NOTE: Check for CAN 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

- Diagnose and repair the DTC(s).

No

- Go To 3


3. VERIFY THAT THE TCM IS ACTIVE ON THE BUS

With the scan tool, select ECU View.

Verify that the TCM is active on the bus.

Is the TCM active on the bus?

Yes

- Go To 4

No

- Refer to Manufacturer Trouble Codes / Communications for No Response related diagnostic procedures.


4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS

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 BODY VERIFICATION TEST VER-1. Body Verification Test

No

- Replace the Anti-Lock Brakes Module.
- Perform BODY VERIFICATION TEST VER-1. Body Verification Test