What does code P0308 mean?

P0308 — Misfire in cylinder 8. V8 only — often the hottest cylinder on Bank 2. Belongs to the powertrain.misfire system. Severity: warning.

What are the common causes of P0308?

Cylinder 8 spark plug; Cylinder 8 ignition coil; Cylinder 8 injector — clogs from the longest fuel path; Cylinder 8 compression — piston ring wear; Wiring/connector to cylinder 8 — hottest spot in the engine bay

Can I drive with code P0308?

Limited: reaching the nearest workshop is fine, but avoid long trips. May progress into a more serious fault.

How do I diagnose P0308?

Read the code and freeze-frame with a scanner, check related-system errors, inspect the components listed (wiring, connectors, sensors). See the "How to diagnose" section above for the full step-by-step.

How do I clear code P0308?

The code can be cleared via an OBD-II scanner (e.g. ELM327 + the Car Diagnostics app): plug the adapter into the OBD port, go to Errors → Clear. If the underlying cause isn't fixed, the code will return within a few drive cycles.

OBD-II Code P0308 — Car Diagnostics Platform

What it means

Common causes

Cylinder 8 spark plug
Cylinder 8 ignition coil
Cylinder 8 injector — clogs from the longest fuel path
Cylinder 8 compression — piston ring wear
Wiring/connector to cylinder 8 — hottest spot in the engine bay
Intake manifold leak
Burnt valve or head crack from chronic overheating

How to diagnose

01
Read all stored and pending codes with an OBD-II adapter — get the full picture, not just the one code.
02
Capture freeze-frame data (RPM, coolant temperature, engine load) at the exact moment the code triggered.
03
Inspect the named subsystem with our app's AI explanation — get vehicle-specific causes for your make, model and year.

Decode P0308 on your actual car

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