OBD-II code · Network
U0402 Invalid Data Received from TCM
A control module is communicating with the transmission control module but receives implausible data — wrong checksum, frozen value, or out-of-range value. Often results in transmission limp-home.
Is it safe to drive with U0402?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- PossibleTCM software bug or outdated calibration
- PossibleTCM internal sensor or processing fault
- PossibleCAN corruption causing checksum errors
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Tcm, Can Bus Wiring
Related codes
- U0354Software Incompatibility With Hybrid/EV Battery Inductive Charger Control Module
- U0400Invalid Data Received
- U0401Invalid Data Received from ECM/PCM
- U0403Invalid Data Received from Transfer Case Control Module
- U0404Invalid Data Received from Gear Shift Control Module
- U0405Invalid Data Received from Cruise Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.