P086A code meaning
Neutral Position Sensor A Circuit/Open
What P086A means
Neutral position sensor A is a position sensor, usually a three-wire Hall sensor, on the shift shaft of a manual gearbox. It tells the engine module that neutral is selected, which start-stop needs before it may switch the engine off. Analog versions need a learned neutral value (P086F). Audi uses it as sender G701 on Q3 and A3, GM on the 2019 Corvette ZR1 with its 7-speed manual, where these codes suspend the gear ratio checks. P086A is the circuit fault: the signal is missing, typically an open supply or signal wire. Audi's bulletin for the sister codes P086D/P086E found the supply wires to G701 too short and lengthened them. Start-stop stays off.
P086A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P086A
- Start-stop not working
- Warning about the start system
- MIL possible depending on maker
Common causes of P086A
- Most likelyWire or connector to the sensor open or chafed
- PossibleSensor faulty
- PossibleCorroded connector low on the gearbox
- Less likelySupply output of the control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Neutral position sensorSensor wiringEngine control moduleManual transmission
What each part of P086A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 8 | Area: transmission. |
| 6A | The exact fault in that area. |
What to do next
- Note P086A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P086A
What does P086A mean?
P086A means "Neutral Position Sensor A Circuit/Open". Neutral position sensor A is a position sensor, usually a three-wire Hall sensor, on the shift shaft of a manual gearbox. It is a generic code, so it means the same on every make.
Is it safe to drive with P086A?
P086A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P086A fail an emissions test?
P086A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P086A to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P086A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.