B0661low severityBody
Rear HVAC Temperature Control Circuit
on 2021 Mazda Mazda3 2.0L I4 · AWD
What this code means
Malfunction in the rear HVAC temperature control actuator or circuit.
Symptoms
- Rear climate stuck on hot or cold
- Rear temperature not adjusting
- Clicking from rear HVAC unit
Common causes
- Faulty rear blend door actuator
- Rear HVAC control module fault
- Wiring issue
- Blend door binding
Diagnostic steps
- Test rear blend door actuator
- Check rear HVAC control module
- Inspect wiring
- Scan for rear HVAC codes
Repair notes
Replace rear blend door actuator or rear HVAC control module.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0006
Passenger Knee Airbag Deployment Circuit
B0007
Rear Left Side Airbag Deployment Circuit
B0008
Rear Right Side Airbag Deployment Circuit
B0009
Rear Center Airbag Deployment Circuit
B0010
Driver Side Airbag Deployment