B0150HVAC Mode Door Range/Performance
- Generic OBD-II code · Body
- How the car detects it
- No publicly available J2012 code list includes B0150, and no carmaker publishes it with this meaning. The mode door decides whether air leaves at the face vents, the footwell or the windscreen. A range/performance fault means the door does not reach the commanded position or its feedback does not fit the command. Many actuators carry a potentiometer geared to the motor that returns roughly 0 to 5 V, as a Motor magazine article explains; Calsonic's patent EP0771679A2 pairs each door motor with such a position detector. GM's Global A climate control, as documented for the 2011 Saab 9-5, uses stepper motors and logs mode actuator circuit faults under B0233 instead. Expect air from the wrong outlets or a door that hunts.
- What you may notice
- Air comes out of the wrong vents or the selected mode is not reached
- Clicking or knocking behind the dashboard while the door moves
- Windscreen demisting weaker because too little air reaches the defrost outlets
- Likely causes
- LikelyMode door or its linkage binding, broken lever or stripped gear
- PossibleMode door actuator worn, feedback track of the potentiometer dirty
- RareEnd positions not relearned after actuator replacement
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.