P08ADNeutral Position Sensor B Circuit/Open
- Generic OBD-II code · Powertrain
- How the car detects it
- A neutral position sensor tells the engine module whether a manual gearbox is in neutral, which start-stop, remote start and rev matching rely on. Sensor B is a second sensor or channel next to sensor A (P086A ff). P08AD flags an open or otherwise faulty sensor B circuit. No manufacturer documents this code publicly; Audi (sender G701) and GM (Corvette LT5) are only known to use the A codes. A GM patent shows why a B channel exists: two Hall sensors on the shift shaft give a PWM signal, and in neutral both must read the same. CARB 1968.2 (e)(15) requires circuit monitoring of such inputs. Expected effect: start-stop stays off; MIL status depends on the maker.
- What you may notice
- Start-stop no longer switches the engine off
- Start system warning in the cluster
- Driving normally unaffected
- Likely causes
- LikelyWire to the sensor broken or stretched by shift shaft movement
- PossibleConnector at the gearbox loose or corroded
- PossibleSensor B open internally
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.