P08AFNeutral Position Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- The signal of neutral position sensor B, the second neutral sensor or channel of a manual gearbox, has fallen below its lower electrical limit. Typical reasons are a signal wire shorted to ground, a missing sensor supply or a sensor without output. No manufacturer documents P08AF publicly; the A-sensor codes are documented by Audi (sender G701, three-wire Hall sensor) and by GM on the LT5 Corvette. A GM patent describes the sensor as two Hall elements on the shift shaft feeding a PWM signal to the engine module. CARB 1968.2 (e)(15) requires low/high circuit monitoring of such inputs. High is P08B0, the A-sensor equivalent P086C. Start-stop is usually blocked; the MIL status is left to the manufacturer.
- What you may notice
- Start-stop no longer works
- Start system warning in the cluster
- Fault stored without driving complaint
- Likely causes
- LikelySignal wire chafed and shorted to ground
- PossibleSensor supply open
- PossibleSensor B without output
- RareWater or corrosion in the connector at the gearbox
- 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.