U062E code meaning
Lost Communication With A/C Refrigerant Expansion Valve Actuator
What U062E means
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.
U062E at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U062E
- No cooling at the affected evaporator or chiller
- Cooling-system warning, possibly reduced drive or charging power on electrified vehicles
- Heat pump unavailable
Common causes of U062E
- Most 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
- Less likelySoftware fault in the thermal or powertrain controller
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac expansion valve actuatorVehicle bus wiring
What each part of U062E means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 2E | The exact fault in that area. |
What to do next
- Note U062E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U062E
What does U062E mean?
U062E means "Lost Communication With A/C Refrigerant Expansion Valve Actuator". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U062E?
Drive gently and only to a workshop. With U062E the car can go into limp mode (reduced power) to protect itself.
Will U062E fail an emissions test?
U062E is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U062E to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will U062E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.