U000100 (Transmission Control Module - TCM)

Diagnostic trouble code (DTC) information TCM-U000100

Condition
The control modules transmit and receive information via a standardized serial communication method - CAN (Control Area Network).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- Communication on the CAN network affected by another control module.
- The control module's internal messages cause interference on the controller area network (CAN).
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Starting the control module's CAN communication.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met. In the event of system communication problems, it is not possible to communicate with the control module. Therefore it will only be possible to read off the fault if it is intermittent.





Substitute value
- Auxiliary program Emergency mode 3 in the transmission control module (TCM) has started.

Hint: Emergency mode in case of malfunction, B6304T4, TF-80SC AWD, B5254T5, TF-80SC Emergency Mode In Case of Malfunction

Possible source
- Short-circuit between the control area network (CAN) wiring.
- Open-circuit in the control area network (CAN) wiring.
- Internal fault in another control module in the same part of the control area network (CAN).
- Internal fault in the control module.

Fault symptom[s]
- Warning lights and chimes/Malfunction Indicator Light ("Check engine" light) indication/no indication
- Text window and warning symbol/Yellow symbol and text message
- Automatic transmission/Shifts rough or jerky/Unsure when/at all times
- Automatic transmission/No automatic gearshift
- Automatic transmission/No manual gear shift
- Automatic transmission/Lockup does not work
- Driving/Poor performance/lacks power