Drive with caution — fix soon.
This code means the engine computer detected high voltage or an open in the electrical circuit for the cylinder 8 fuel injector. It usually points to a broken or disconnected wire, a corroded connector, or a failing injector on that cylinder. It's an electrical circuit fault that's typically fixed by repairing wiring or replacing the injector, not major engine work.
$120 – $600
Varies by vehicle and root cause.
Usually yes for short trips, but it's not ideal. The cylinder 8 injector may not be working right, causing rough running and possible converter damage over time. Have it checked soon.
Fixing a wire or connector can start around $120, while replacing the injector usually runs $300 to $600 depending on your vehicle. Diagnosis confirms whether it's wiring or the injector itself.
It's moderate. The engine often still runs, but a cylinder that isn't fueling properly hurts performance and can damage the catalytic converter if ignored. Fix it promptly to be safe.
Both involve the cylinder 8 injector circuit. P0283 means the computer saw low voltage, often a short, while P0284 high usually means an open circuit or broken connection. The diagnosis differs slightly, but both point to wiring or the injector.