Lost Communication With TCM on BMW
BMW
Verified1 source
1 source
- Official data (NHTSA)official_feed
What U0101 means
Avoid long trips
The engine/body control module has lost communication with the transmission control module.
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Lost Communication With TCM
What to check first
- Check CAN bus wiring and termination
- Verify battery voltage and grounds
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