P08B0 code meaning
Neutral Position Sensor B Circuit High
What P08B0 means
P08B0 reports that the signal of neutral position sensor B on a manual gearbox is above its upper electrical limit. With a three-wire Hall sensor this usually points to an open signal or ground wire or a short to voltage. No manufacturer documents P08B0 publicly. For the A sensor Audi does: the 2019–20 Q3 and 2022–23 A3 store P086D/P086E because the wires to sender G701 were too short and were pulled apart by shifting, fixed by lengthening them 20 mm; the same harness logic applies to a B sensor. A GM patent explains the dual-Hall neutral sensor with PWM output. CARB 1968.2 (e)(15) requires circuit monitoring. Low is P08AF; start-stop is typically off.
P08B0 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 P08B0
- Start-stop does not switch the engine off
- Start system warning in the cluster
- Fault may come and go with gear changes
Common causes of P08B0
- Most likelySignal or ground wire pulled apart, harness too short
- PossibleSignal wire shorted to voltage
- PossibleSensor B open internally
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Neutral position sensor bWiring harnessEngine control module
What each part of P08B0 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. |
| B0 | The exact fault in that area. |
What to do next
- Note P08B0 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 P08B0
What does P08B0 mean?
P08B0 means "Neutral Position Sensor B Circuit High". P08B0 reports that the signal of neutral position sensor B on a manual gearbox is above its upper electrical limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P08B0?
P08B0 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P08B0 fail an emissions test?
P08B0 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 P08B0 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P08B0 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.