Severity: Moderate
Drivable, but it can cause more damage or poor economy. Get it checked within days.
What U0101 means
A module lost communication with the transmission control module.
Symptoms
- Shifting problems
- Gear indicator missing
Common causes
Most likely first
- 1TCM power, ground or fuse
- 2CAN wiring
- 3Failed TCM
How we diagnose it
- Check TCM fuses, power and ground
- Network test
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.