P0308High urgency

Cylinder 8 Misfire Detected

Powertrain · Ignition System

⛔ Stop driving if the check engine light is flashing. Catalytic converter damage risk. Service immediately.

What this means

Cylinder 8 misfire detected — specific to V8 engines. On GM LS engines, Cylinder 8 is at the rear of the passenger-side bank.

Likely causes

Estimated repair cost

Spark plug$20 – $80

Ignition coil$60 – $200

Lifter repair (if AFM/DoD failure)$1,500 – $4,000

Frequently asked questions about P0308

Cylinder 8 misfire detected — specific to V8 engines. On GM LS engines, Cylinder 8 is at the rear of the passenger-side bank.

Stop driving if the check engine light is flashing. Catalytic converter damage risk. Service immediately.

Repair costs for P0308 range from $20 – $80 depending on the root cause and your vehicle.

No — this code indicates a serious issue. Stop driving and have the vehicle inspected immediately.