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U065C Lost Communication With Right Front Mode Actuator

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

A right front mode actuator lets the passenger side choose its own outlets, or in some designs close its share of the air altogether; Denso's US 2020/0189351 describes a passenger-side door driven by its own actuator so that only the driver is served. U065C means the climate master can no longer reach that right-hand unit over LIN. No maker publishes the code, so detection time and fallback depend on the vehicle. In practice the right outlets keep their last position while the left side still follows commands, so the two halves of the cabin drift apart: the passenger may get floor air when the driver asks for vents, or no air at all if the door stopped closed. Windshield defog is mostly handled by the left or a common door and stays usable.

Likely causes

Right mode actuator internal fault
Connector on the passenger side of the HVAC case loose or wet
Damaged LIN branch toward the passenger side

Symptoms

  • Passenger outlets ignore mode changes
  • Little or no airflow on the passenger side
  • Uneven comfort between driver and passenger

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–450
Time0.5–3 h

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

Parts involved

rf mode actuatorvehicle bus wiring

Related codes

U065BU065AU0164B0150

References: patents.google.com, static.nhtsa.gov, nxp.com.