P0208 Code: Injector Circuit Malfunction - Cylinder 8

🟠 Moderate severity · drivable

Drivable short-term, but cylinder 8 may misfire and raw fuel can hurt the catalytic converter — fix it soon.

What P0208 means

The engine computer has flagged an electrical fault in the fuel injector circuit for cylinder 8, so it can't control that injector. This is a wiring/circuit problem rather than a fuel-pressure issue, and it often appears alongside a cylinder 8 misfire (P0308) because cylinder 8 isn't getting proper fuel.

Symptoms

Check engine light on (may flash)
Rough idle or misfire on cylinder 8
Loss of power
Poor fuel economy

Common causes

most common: Faulty fuel injector on cylinder 8 (internal electrical fault)
common: Damaged wiring or a loose connector at the cylinder 8 injector
less common: Injector driver failure in the engine computer (PCM)

How to fix it

Fix	DIY?	Typical cost
Test the cylinder 8 injector circuit with a noid light	Yes	$10–30
Swap the cylinder 8 injector to another cylinder to confirm the fault follows it	Mechanic	$100–300
Replace the cylinder 8 fuel injector	Mechanic	$100–300
Repair damaged injector wiring or connector	Mechanic	$50–150

Frequently asked questions

Is P0208 a wiring or fuel issue?

Wiring/circuit. P0208 means the injector circuit can't be controlled electrically, which often leads to a cylinder 8 misfire (P0308).

How do I test a P0208?

Plug a noid light into the cylinder 8 injector connector. A flashing light means the computer is commanding it; no flash points to wiring or the computer driver.

Can I drive with a P0208?

Short distances only — cylinder 8 may misfire and push unburned fuel into the catalytic converter.

Related codes

P0308

P0308 Code: Cylinder 8 Misfire Detected

P0200

P0200 Code: Injector Circuit Malfunction

P0268

P0268 Code: Cylinder 3 Injector Circuit High

Updated 2026-08. This page is informational and not a substitute for professional diagnosis.