B0175
HVAC Recirculation Door Performance
The HVAC control module has detected that the recirculation door does not reach the commanded position within the expected time. The recirc door switches between fresh air and recirculated cabin air.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Common causes
Ordered by how often each turns out to be the cause.
- Recirculation door actuator failedCommon
- Recirculation door mechanically bindingPossible
Parts involved
- Recirculation Door Actuator
- Hvac Control Module
B0175 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.