B0624moderate severityBody
Mode Door Actuator Circuit
on 2001 Mazda MX-5 Miata 1.8L I4 · RWD
What this code means
Malfunction in the HVAC mode door actuator. The mode door directs airflow to floor, dash, or defrost outlets.
Symptoms
- Air only comes from one set of vents
- Cannot switch between floor/dash/defrost
- Defrost mode not available
- Clicking behind dashboard when changing modes
Common causes
- Faulty mode door actuator
- Mode door binding
- Stripped actuator gears
- HVAC control module fault
- Wiring damage
Diagnostic steps
- Listen for actuator when changing mode
- Test actuator with direct power
- Check for mechanical binding
- Inspect actuator gears
- Scan HVAC module
Repair notes
Replace mode door actuator. Ensure mode door moves freely before installing new actuator.
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
B0010
Driver Side Airbag Deployment
B0011
Driver Side Airbag Deployment Circuit Open
B0012
Driver Side Airbag Deployment Circuit Short to Ground
B0013
Driver Side Airbag Deployment Circuit Short to Battery