U0101 – Lost Communication With TCM
- System
- Network
- Dashboard light
- Check engine light (MIL)
- Check-engine blink code
- —
- Applies to
- Generic OBD-II meaning. Not every code is used by this car.
- Description
- Lost Communication With TCM
- Detection / symptoms
- 1.Check engine light on 2.Vehicle will not shift 3.Vehicle stays in one gear (usually 2nd or 3rd)
- Possible causes
- 1.Typically the causes for this code to set are 2.Open in the CAN bus + circuit 3.Open in the CAN bus - circuit 4.Short to power in either CAN bus circuit 5.Short to ground in either CAN bus circuit 6.Rarely - faulty control module
- What to check
- 1.Check battery voltage and the main fuses 2.Check the connectors of the module named in the code 3.Read codes from all modules with a capable scanner
- Confidence
- medium (generic OBD-II definition, not checked against the factory manual for this car)
Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights
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