B0263HVAC Air Mix Door 2 Circuit
- Generic OBD-II code · Body
- How the car detects it
- B0263 shares the fate of its sibling B0258: no publicly available J2012 source lists it and no maker describes it. The second blend door usually serves the passenger side or the rear zone. Saab's 9-5 and 9-4X service data, which follow GM's Global A scheme, file the right temperature actuator under B0418 and the rear one under B0428, each a stepper motor checked for shorts to voltage and for opens. Some designs save the second motor: Denso's US7793706B2 drives the front door and a pair of rear doors from one servo through cams and a rocker, so a single failure would affect both zones. When the second door's circuit fails, the passenger or rear side stays at a fixed temperature while the driver side keeps regulating.
- What you may notice
- Passenger side or rear outlets stay at one temperature whatever is set
- Noticeable temperature difference between left and right outlets
- Likely causes
- LikelyPassenger-side or rear blend actuator failed
- PossibleWiring to the second actuator open or shorted, often near the centre console
- RareShared linkage or door shaft broken, overloading the drive
- Repair
- Medium · Often possible to do yourself.Typical cost: €80 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.