Network, generic

U062D Lost Communication With A/C Refrigerant Distribution Valve Actuator D

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Actuator D is the fourth refrigerant switching valve and appears only in loops with many separately controlled paths; because a single multi-way unit can replace up to four solenoid valves, many vehicles never use the letter D. U062D means the controller sent requests to valve D and got no valid answer within its expected schedule. No manufacturer documents U062D publicly. A useful check is whether the actuator wakes up and draws current when commanded: no current hints at supply or ground, current without reply at the LIN line or the actuator itself. Replacing a valve body means opening the refrigerant circuit, so recovery, evacuation and recharge are part of the job. Related actuators are U062A to U062C.

Likely causes

Supply or ground of actuator D missing (no current draw when commanded)
LIN line to actuator D open or shorted
Actuator D electronics failed

Symptoms

  • One refrigerant path cannot be opened or closed
  • Reduced heating or cooling in certain modes

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 dvehicle bus wiring

Related codes

U062AU062BU062C

References: egelhof.com, law.cornell.edu.