Rear HVAC Temperature Control Circuit
2016-2016 Subaru Forester 2.5L H4
The 2016 Subaru Forester is equipped with a 2.5L flat-4 engine. Below you'll find detailed b0661 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
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.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0009Rear Center Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
B0661 on Other Vehicles
Common Questions
What does code B0661 mean on a 2016-2016 Subaru Forester?
B0661 stands for "Rear HVAC Temperature Control Circuit". Malfunction in the rear HVAC temperature control actuator or circuit.
What are the symptoms of B0661 on a Subaru Forester?
Common symptoms of B0661 include: Rear climate stuck on hot or cold, Rear temperature not adjusting, Clicking from rear HVAC unit.
What causes B0661 on a 2016-2016 Subaru Forester?
Common causes of B0661 include: Faulty rear blend door actuator, Rear HVAC control module fault, Wiring issue, Blend door binding.
Last updated: March 2026