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U065A Lost Communication With Right Front Temperature Actuator

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

The right front temperature actuator only exists where the right-hand front seat gets its own blend door, as in dual-zone systems; single-zone cars move one door for both sides and never run this check. GM lists U065A next to U0659 in its 2025 BCM tables, watching the frame AHDA05_Rsp with the same 11.5 s limit and Type B rating; in 25OBDG04B that slave is calibrated as not present, so the monitor stays idle on that build. Its GM partners are U1410 for corrupt counters and B2B06, B2B2B and B2B2C for travel faults. FCA shows how a failing right door feels: 2014-15 Town and Country and Grand Caravan blew hot air from the right vents until the actuator passed a wiTECH calibration or was renewed. Here the link itself is gone, so the right side holds its last mix.

Likely causes

Right temperature actuator electronics or motor failed
Wire to the actuator damaged behind the glovebox or console side panel
Climate module configured for the wrong number of zones after replacement

Symptoms

  • Passenger side blows hot or cold no matter what is selected
  • Right temperature setting has no effect while the left side works
  • MIL possible on GM models with the code rated Type B

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–450
Time0.5–2.5 h

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

Parts involved

rf temp actuatorvehicle bus wiring

Related codes

U0659U065CU0164B0168

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.