U0664

Lost Communication With Rear HVAC Air Cutoff Actuator

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$13–94 (est.)

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

U0663 U0665 B1413