B0150
HVAC Mode Door Range/Performance
The HVAC control module has detected that the air distribution mode door (e.g. floor/face/defrost) does not reach the commanded position within the expected time. The actuator may be stuck, the door binding, or the position feedback inaccurate.
- 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.
- Mode door actuator motor failedCommon
- Mode door mechanically bindingPossible
- Wiring or connector fault to actuatorLess likely
Parts involved
- Mode Door Actuator
- Hvac Control Module
- Mode Door Linkage
B0150 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.