OBD-II Generic Error Code P0305: How to Fix It

Q: Can I drive with P0305 error code?

You can drive short distances, but it's not recommended. A misfire causes unburned fuel to enter the exhaust, which can overheat and damage the catalytic converter. It also reduces fuel economy and engine performance.

Q: What is the most common cause of P0305?

The most common cause is a faulty spark plug or ignition coil on cylinder 5. Fuel injector issues and vacuum leaks are also frequent culprits.

Q: How much does it cost to fix P0305?

Costs vary widely. A single spark plug may cost $5-20, a coil $50-200, and an injector $50-300. Labor adds $100-200 per hour. DIY can save significantly.

Q: Will P0305 clear itself?

The code may clear if the misfire stops for several drive cycles, but the underlying problem will persist and may return. It's best to fix the root cause.

Q: What does P0305 mean on an OBD2 scanner?

It means cylinder 5 is misfiring. The powertrain control module (PCM) detected a drop in crankshaft speed during cylinder 5's power stroke.

Abstract

Error code P0305 means your car's engine control module has detected a misfire in cylinder 5. A misfire occurs when the air-fuel mixture in that cylinder fails to ignite properly, causing roughness, loss of power, and increased emissions. If left unaddressed, it can damage the catalytic converter and oxygen sensors.