P086CNeutral Position Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- Neutral position sensor A is a three-wire Hall sensor on the shift shaft of a manual gearbox that reports neutral to the engine module; start-stop may only switch the engine off in neutral. Audi uses it as sender G701 on the Q3 and A3, GM on the 2019 Corvette ZR1 manual, where its faults suspend the gear ratio checks. Thresholds and MIL status are not published. P086C means the signal is below its lower limit: signal wire shorted to ground, supply missing or a sensor without output. GM lists it among the exclusions of its gear checks; the neutral state is then unknown and start-stop stays off.
- What you may notice
- Start-stop not working
- Start system warning in the cluster (Audi)
- No noticeable change in driving
- Likely causes
- LikelySignal wire shorted to ground or supply wire open or chafed
- PossibleNeutral position sensor faulty
- PossibleCorrosion or water in the connector
- Rare5 V reference of the module disturbed
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.