U063ALost Communication With Hybrid/EV Electronics Coolant Temperature Sensor C
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Sensor C is the third digitally connected temperature sensor in the cooling loop for the hybrid or EV power electronics. It is found where a system splits the loop further, for example to give a DC/DC converter or onboard charger its own reading. U063A is stored when its frames stop arriving. No public manufacturer documentation names this code or the location of sensor C. California's OBD II rule lists inverter cooling inputs among the monitored parts, so a hybrid has to flag the loss. If only U063A is present while A and B still answer, a local fault at sensor C or its branch of the harness is far more likely than a bus-wide problem. The analog counterparts are P2B24 to P2B27.
- What you may notice
- Hybrid or EV warning lamp
- Possible reduction of charging or drive power
- Likely causes
- LikelyOpen or chafed wire in the branch that feeds sensor C only
- PossibleSensor C connector unplugged after service work or corroded
- PossibleSensor C electronics defective
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.