U0101

U0101 means: Lost Communication With TCM. Lost communication with the transmission control module.

Lost Communication With TCM

Lost communication with the transmission control module.

SeverityCritical

CategoryNetwork / CAN

Est. Repair Cost$400–$1500

Code TypeNetwork

DIY RepairProfessional

💡 Pro Tip: U0101 often appears after battery replacement or jump-starting — check connections before assuming module failure.

Full Repair Estimate

$400–$1500

DIY Possible?

PRO

Severity

Critical

What does OBD2 code U0101 mean?+

U0101 stands for Lost Communication With TCM. Lost communication with the transmission control module.

What causes code U0101?+

Faulty TCM; CAN bus wiring fault; Blown TCM fuse; Poor TCM ground; Battery issue

How do I fix code U0101?+

Check TCM fuses; Inspect TCM wiring and connectors; Test CAN bus continuity; Replace TCM

How much does it cost to fix U0101?+

Estimated repair cost for U0101 is $400–$1500.

Is U0101 DIY-friendly?+

U0101 typically requires professional equipment and a qualified mechanic.