P086C code meaning
Neutral Position Sensor A Circuit Low
What P086C means
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.
P086C 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 P086C
- Start-stop not working
- Start system warning in the cluster (Audi)
- No noticeable change in driving
Common causes of P086C
- Most likelySignal wire shorted to ground or supply wire open or chafed
- PossibleNeutral position sensor faulty
- PossibleCorrosion or water in the connector
- Less likely5 V reference of the module disturbed
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 P086C 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. |
| 6C | The exact fault in that area. |
What to do next
- Note P086C 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 P086C
What does P086C mean?
P086C means "Neutral Position Sensor A Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P086C?
P086C does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P086C fail an emissions test?
P086C 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 P086C to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P086C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.