B0305
HVAC Sun Load Sensor Circuit
A fault has been detected in the sun load sensor circuit used by automatic climate control to compensate for solar gain.
- 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.
- Sun load sensor failureCommon
- Open wire in dashboardPossible
Parts involved
- Sun Load Sensor
- Hvac Control Module
B0305 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.