U0101
Lost Communication with TCM
System: Network
Severity: medium
What does U0101 mean?
The DTC U0101 (Lost Communication with TCM) is a fault code stored by the ECU when it detects a lost comm TCM condition in the network subsystem. It is commonly seen on European and Asian vehicles using Bosch, Continental, Siemens or Denso ECUs.
Common causes of U0101
- TCM failed
- CAN to TCM wiring fault
- TCM power/ground
- Connector corrosion
How to fix U0101
Check TCM power. CAN bus continuity to TCM connector.
Tuning approach with DaVinci Deluxe · Cloud Edition
For U0101, DaVinci Deluxe · Cloud Edition offers the following ECU map adjustments and software solutions:
- TCM coding restore
- (repair network first)
Need to fix U0101 on your ECU?
DaVinci Deluxe · Cloud Edition is professional ECU tuning software trusted by 800+ workshops. 24-Hour Pass €45.99, 10 minutes free trial.
See pricing Try free