U062ELost Communication With A/C Refrigerant Expansion Valve Actuator
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- An electronic expansion valve uses a geared or stepper motor to set the refrigerant flow into an evaporator or battery chiller, guided by pressure and temperature readings instead of a thermostatic bulb. Units such as Egelhof's EXV and KXV accept their target position over LIN and carry a position sensor, so they can also shut a branch completely. U062E is logged when that actuator stops answering. No manufacturer documents U062E publicly. The consequences can reach the drivetrain: on Mercedes EQE and EQS models (series 294 to 297) a faulty chiller expansion valve Y140/1 triggered a cooling-system warning announcing reduced energy input, though there the valve hung open (code B3A0077) rather than going silent. Distribution valves are covered by U062A to U062D.
- What you may notice
- No cooling at the affected evaporator or chiller
- Cooling-system warning, possibly reduced drive or charging power on electrified vehicles
- Heat pump unavailable
- Likely causes
- LikelyLIN, supply or ground wire to the expansion valve damaged
- PossibleConnector at the valve wet or corroded (often near the evaporator or chiller)
- PossibleExpansion valve motor electronics failed
- RareSoftware fault in the thermal or powertrain controller
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.