What does code P0306 mean?

P0306 — Misfire in cylinder 6. On V6 this is the last cylinder — often wears first due to heat exposure. Belongs to the powertrain.misfire system. Severity: warning.

What are the common causes of P0306?

Cylinder 6 spark plug — replace as a full set; Cylinder 6 ignition coil (V6: hottest position); Cylinder 6 injector; Cylinder 6 compression — piston ring wear; Wiring/connector to cylinder 6

Can I drive with code P0306?

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

How do I diagnose P0306?

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 P0306?

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 P0306 — Car Diagnostics Platform

What it means

Common causes

Cylinder 6 spark plug — replace as a full set
Cylinder 6 ignition coil (V6: hottest position)
Cylinder 6 injector
Cylinder 6 compression — piston ring wear
Wiring/connector to cylinder 6
Intake manifold leak
V6: burnt valve or cracked head

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 P0306 on your actual car

Plug in an OBD-II adapter and get an AI-powered diagnosis tailored to your vehicle make, model and year — in 30 seconds.

Try the demo