P086FNeutral Position Sensor A Not Learned
- 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. Analog neutral sensors need a learned neutral window to cover part and fitting tolerances. P086F means no valid value is stored, typically after a sensor, gearbox, clutch or module replacement, a software update or an aborted learn run; Schaeffler's patent rejects runs with an unsteady lever. FCA describes cruise control failing after service until the neutral learn is done, without new parts.
- What you may notice
- Start-stop not working
- Cruise control cannot be set (FCA)
- Fault appears after a workshop visit
- Likely causes
- LikelyLearn procedure not done after replacing sensor, gearbox or module
- PossibleLearn run aborted: lever strained, linkage misadjusted
- PossibleSoftware update deleted learned values
- RareSensor fitted outside the learnable range or faulty
- Repair
- Easy · Usually a job for a workshop.Typical cost: €30 – €150
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.