OBD-II code · Body
B0173 HVAC Air Inlet Door
The HVAC control module has detected a fault on the fresh-air/recirculation inlet door — typically a stuck actuator or position feedback out of range.
Is it safe to drive with B0173?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyInlet door actuator failed
- PossibleInlet door mechanically binding
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Air Inlet Door Actuator, HVAC Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.