B0175HVAC Recirculation Door Performance
- Generic OBD-II code · Body
- How the car detects it
- The J2012 tables at hand leave out B0175, and no maker ties it to the recirculation door; a recirculation door circuit has the code B0273. Saab assigns the number to a temperature sensor instead. Its 9-3 climate control manuals read B0175 02 as a grounded left vent air mix temperature sensor, with the 2003 manual naming an input below 0.2 V, and the module then borrows the value of the left floor sensor; B0176 is its open circuit. GM's Global A system logs recirculation door actuator faults under B0223 and B022A instead. The recirculation door switches between fresh and cabin air, and HELLA notes that an air quality sensor can move it automatically. Check the make's definition first.
- What you may notice
- Recirculation cannot be switched or windows fog because the door stays on recirculate
- Saab 9-3: left outlet temperature regulated less precisely
- Likely causes
- PossibleRecirculation door sticking or its actuator gear stripped
- PossibleSaab 9-3: left vent air mix sensor or its lead shorted to ground
- RareActuator wiring or connector fault behind the glovebox
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.