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U062A Lost Communication With A/C Refrigerant Distribution Valve Actuator A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Heat pumps and battery-cooling circuits need valves that redirect refrigerant, for example hot gas from the outer heat exchanger to an inner one when the system switches from cooling to heating. Suppliers such as Egelhof build these as motor-driven switching valves that replace two or more solenoid valves and are commanded digitally, partly via LIN. U062A is set when actuator A no longer answers its controller. No manufacturer documents U062A publicly. How serious it is depends on what the valve feeds: BMW, for one, lit the MIL on the i3 for a jammed refrigerant shutoff valve in the battery cooling branch (its own code 21F0D0). Hardwired versions of valve A report P2611 to P2613, P266F or the mechanical fault P0EC9.

Likely causes

LIN, supply or ground wire to valve actuator A damaged
Moisture or corrosion in the actuator connector
Actuator electronics failed
Software fault in the controlling module (reprogramming may be needed)

Symptoms

  • Switching between cooling and heat-pump mode fails
  • No cabin heat from the heat pump or no cooling in one branch
  • Thermal system warning, possibly reduced charging or drive power

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–900
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ac distribution valve actuator avehicle bus wiring

Related codes

U062BU062CU062DU062EP2611P2612P2613P266FP0EC9

References: egelhof.com, static.nhtsa.gov, law.cornell.edu.