OBD-II code · Network
U05AC Invalid Data Received From Vehicle Thermal Management Control Module
A receiving module detected implausible data from the vehicle thermal management module. Coolant loop coordination values fail plausibility checks and are rejected; sub-modules may revert to local control.
Is it safe to drive with U05AC?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- Less likelyGateway module routing CAN messages incorrectly
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
- 1–4 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Thermal Management Module
Related codes
- U05A9NOx Sensor C Received Invalid Data From ECM/PCM
- U05AAInvalid Data Received From Charge Air Cooler Coolant Pump
- U05ABInvalid Data Received From Engine Disconnect Clutch
- U05B2Invalid Data Received From Comfort and Convenience Display A
- U05B3Invalid Data Received From Comfort and Convenience Display B
- U05B4Invalid Data Received From Driver Monitoring System Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.