OBD-II code · Body
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.
Is it safe to drive with B0305?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySun load sensor failure
- PossibleOpen wire in dashboard
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
- 0.5–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Sun Load Sensor, HVAC Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.