U0664
Lost Communication With Rear HVAC Air Cutoff Actuator
U0664 is an OBD-II diagnostic trouble code meaning: Lost Communication With Rear HVAC Air Cutoff Actuator. Common causes: open or short circuit in control circuit, damper actuator malfunction. Estimated repair cost: $13–94.
Symptoms
- It is impossible to regulate the air supply to the rear seats
- Uneven airflow distribution
- Rear deflectors do not respond to settings
- Hot/cold air is not supplied correctly
Causes
- Open or short circuit in control circuit
- Damper actuator malfunction
- Rear HVAC Unit Wiring Harness Problems
- Climate control circuit fuse blown
- Oxidation of connector contacts
How to Fix
- Check climate system fuses
- Diagnose the damper mechanism with a multimeter
- Check the integrity of the wires to the rear HVAC unit
- Clean the connector contacts
- If necessary, replace the actuator
Related codes
Error U0664 by Vehicle Brand
FAQ
What does the U0664 code mean?
U0664 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Rear HVAC Air Cutoff Actuator
What causes a U0664 error code?
The most common causes of U0664 include: Open or short circuit in control circuit; Damper actuator malfunction; Rear HVAC Unit Wiring Harness Problems; Climate control circuit fuse blown.
How do I fix a U0664 diagnostic trouble code?
To fix U0664: Check climate system fuses. Diagnose the damper mechanism with a multimeter. Check the integrity of the wires to the rear HVAC unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0664?
Yes, but get it checked soon
How much does it cost to fix U0664?
The estimated repair cost for U0664 is $13–94. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat