B0263
HVAC Air Mix Door 2 Circuit
A fault has been detected in the air mix door 2 actuator circuit, used in dual-zone HVAC systems for the passenger side.
- 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.
- Actuator motor failureCommon
- Mix door jammedPossible
Parts involved
- Hvac Air Mix Actuator 2
- Hvac Control Module
B0263 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.