Network
generic / SAE
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.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number4 / 02
Possible causes
- TCM software bug or outdated calibration medium
- TCM internal sensor or processing fault medium
- CAN corruption causing checksum errors medium
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 80–1800 €
- Estimated time: 1–5 h
- Component: tcm
- Component: can bus wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012