P0286 Code: Cylinder 9 Fuel Injector Circuit High
🟠 Moderate severity · drivable
Drivable, but cylinder 9 may misfire and the engine can run rough. Have it checked soon.
What P0286 means
The fuel injector circuit for cylinder 9 is reading higher voltage than the computer expects. That usually means the circuit is shorted or the injector is failing, so the computer cannot control fuel delivery to that cylinder correctly.
Symptoms
- Check engine light on
- Rough idle or misfire
- Loss of power
- Poor fuel economy
Common causes
- most common: Shorted or damaged wiring in the cylinder 9 injector circuit
- common: Faulty fuel injector on cylinder 9
- common: Loose or corroded injector connector
- rare: Injector driver fault inside the engine computer
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and clean the cylinder 9 injector connector | Yes | $0–10 |
| Repair shorted or damaged injector wiring | Mechanic | $50–200 |
| Replace the cylinder 9 fuel injector | Mechanic | $100–300 |
Frequently asked questions
Can I drive with P0286?
Yes, but cylinder 9 may misfire and the engine can run rough. Fix it soon to avoid damaging the catalytic converter.
What causes a P0286 code?
Usually a short or wiring problem in the cylinder 9 injector circuit, or a faulty injector.
How much does it cost to fix P0286?
Typically $100–$300 for a new injector, or less if it is just a wiring or connector repair.
Related codes
P0285
P0285 Code: Cylinder 9 Fuel Injector Circuit Low
P0287P0287 Code: Cylinder 9 Fuel Injector Contribution/Balance
P0309P0309 Code: Cylinder 9 Misfire Detected
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.