P0286 — Cylinder 9 Injector Circuit Low
Drivable short-term, but fix now to avoid damage.
What P0286 means
This code means the engine computer detected a low-voltage condition in the electrical circuit that controls the fuel injector for cylinder 9. It usually points to a short to ground, a wiring problem, a bad connector, or a failing injector itself. It's a fairly common circuit fault and is often fixable by repairing wiring or replacing a single injector without major engine work.
Common symptoms
- Check engine light is on
- Rough idle or engine shaking
- Engine misfire or hesitation
- Loss of power or sluggish acceleration
- Increased fuel consumption
Common causes
- Short to ground in the injector wiring
- Damaged or corroded injector connector
- Failed or shorted fuel injector for cylinder 9
- Chafed or pinched wiring harness
- Faulty engine control module (less common)
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0286 code?
For short trips, usually yes, but you shouldn't rely on it. A misfiring cylinder can send unburned fuel into the catalytic converter and cause costly damage over time, so get it diagnosed soon.
How much does it cost to fix a P0286 code?
Most repairs run between $150 and $500. A simple wiring or connector fix is on the low end, while replacing the cylinder 9 injector and diagnostic time pushes it higher.
Is P0286 a serious code?
It's on the more serious side because it affects how a cylinder fires. It won't usually leave you stranded immediately, but ignoring it can lead to catalytic converter damage and worse running problems.
Why does P0286 point specifically to cylinder 9?
Each injector has its own monitored circuit, so the computer can pinpoint that the low-voltage fault is on cylinder 9. This is common on larger V8, V10, and V12 engines that have nine or more cylinders.