U0648Lost Communication With Motor Electronics Coolant Pump 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
- U0648 belongs to a third digitally controlled pump in the motor electronics cooling, labelled C, which only more elaborate layouts carry, for example a generator inverter with its own loop. The fault means the pump has dropped off the bus. No carmaker publishes a description of U0648, so which component pump C cools has to be taken from the vehicle's own service information. CARB's rule for inverter thermal management, (e)(15.2.3)(B)(ii), still applies to hybrids. A pump with plain wiring would report P2BD4 to P2BD7 or the internal faults P2D0A to P2D0E. If A, B and C drop out together, look for a shared cause such as a common fuse, ground point or bus master rather than three failed pumps.
- What you may notice
- Hybrid or EV warning lamp
- Reduced power from the electric machine cooled by pump C
- Likely causes
- LikelyData or supply line to pump C damaged
- PossibleShared fuse or ground point of the pumps faulty (several pump codes at once)
- PossiblePump C controller failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.