U0101Severity: High
U0101 – Lost Communication With TCM
The vehicle can't communicate with the transmission control module over CAN.
What it means
Other modules lose communication with the transmission control module (TCM) over the data bus. Gear functions and limp mode can be affected.
Symptoms
- Harsh/non-working shifts
- Limp mode
- Multiple warning lights
- Check-engine light
Common causes
- CAN bus wiring fault
- TCM power/ground issue
- Faulty TCM
- Connector/corrosion
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Frequently asked questions
What does trouble code U0101 mean?
U0101 – Lost Communication With TCM. Other modules lose communication with the transmission control module (TCM) over the data bus. Gear functions and limp mode can be affected.
Can I drive with a U0101 code?
This code is high severity. Driving for long can damage the engine; have it checked as soon as possible.