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Home / DTC / U065A — Lost Communication With Right Front Temperature Actuator

U065A — Lost Communication With Right Front Temperature Actuator

Detailed page for trouble code U065A.

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Code

U065A

Generic U — Network/User

Lost Communication With Right Front Temperature Actuator

Brand: Generic
Type: U — Network/User
Views: UK: 12 EN: 22 RU: 17
AI status
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Page language: EN

Causes

  • Open, shorted, or damaged wiring between HVAC control module and right front temperature actuator
  • Corroded, loose, or damaged connector at the actuator or HVAC module
  • Failed right front temperature actuator (motor or internal electronics)
  • Faulty HVAC/zone control module or Body Control Module (BCM)
  • Blown fuse or poor ground for actuator power circuit
  • Network fault on LIN/CAN bus (termination, interference, high resistance)

Symptoms

  • Right front HVAC zone temperature cannot be changed or is stuck
  • Actuator does not move when changing temperature or zone settings
  • HVAC warning or message on dash (climate control fault)
  • Stored U065A DTC (may be accompanied by other network-related codes)
  • Audible clicking from actuator if motor trying and failing or silence if dead

What to check

  • Read and record all DTCs and freeze frame data with a scan tool; note any other U-codes or HVAC codes
  • Verify if the vehicle has a LIN or CAN actuator network (service manual)
  • Visually inspect actuator connector and wiring for corrosion, damage, pin push-out, or water intrusion
  • Check relevant fuses and relay feeding the actuator and HVAC module
  • With key on, backprobe actuator connector to verify battery voltage on supply terminal and good ground
  • Check for communication messages to/from HVAC module and actuator using a capable scan tool or network data logger

Signal parameters

  • Battery supply to actuator: ~12 V (key ON) on power terminal
  • Ground: near 0 V, continuity to chassis ground (
  • LIN bus (if used): idle voltage typically near vehicle battery voltage; commands appear as pull-down pulses (check service info)
  • CAN bus (if used): CANH ~2.5 V and CANL ~2.5 V idle; differential ~0 V idle, differential ~2 V during data. Two 120 ohm termination resistors (total ~60 ohm)
  • Actuator motor current: varies by design; significant load or open circuit indicates mechanical fault (refer to service data)

Diagnostic algorithm

  1. Connect a full-function scan tool and record this and any related network/HVAC codes. Note whether the right front actuator appears in module data.
  2. Confirm vehicle wiring topology (LIN or CAN) and identify connector/pin assignments for the right front temperature actuator and HVAC module from wiring diagram.
  3. Visually inspect connectors and wiring for damage, corrosion, water intrusion or disconnected pins. Repair any obvious faults.
  4. Verify supply and ground at the actuator connector with key ON. If supply or ground is missing, trace and repair fuse, relay, or ground circuit.
  5. Check communication lines: measure CANH/CANL or LIN line voltages and compare to expected values. Inspect bus termination resistance (CAN ≈60 ohms).
  6. If communication is intermittent, perform a wiggle test of harness while monitoring bus traffic and actuator status. Repair harness as needed.
  7. If power, ground, and bus are good but actuator does not respond to commands from the scan tool, command the actuator and monitor for movement and current draw. No response suggests internal actuator failure—replace actuator.
  8. After repairs, clear codes and perform functional test of HVAC right front temperature zone. If code returns, extend diagnosis to HVAC module replacement or reprogramming per manufacturer service information.
  9. If multiple modules on the network show communication errors, diagnose the network (termination, shorts to battery/chassis, module faults) before replacing actuators.

Likely causes

  • Failed actuator motor or internal electronics
  • Damaged connector or wiring harness (pin corrosion, bent pins, chafing)
  • Blown fuse or poor ground at actuator power circuit
  • Loss of LIN/CAN network signal due to open/short or missing termination resistor
  • HVAC control module fault or software/configuration issue

Fault status

⚠️ Status
Lost Communication With Right Front Temperature Actuator
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours
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