Question 1

What does P0300 mean?

Accepted Answer

P0300 - Random/Multiple Cylinder Misfire Detected. Misfires occurring in multiple cylinders. The problem is affecting the whole engine, not just one cylinder.

Question 2

What are the symptoms of P0300?

Accepted Answer

Check engine light (often flashing), Rough idle, Stumbling, Loss of power, Poor economy, Shaking at idle

Question 3

What causes P0300?

Accepted Answer

Worn spark plugs, Vacuum leak, Low fuel pressure, Faulty MAF sensor, EGR valve stuck open, Head gasket leak, Low compression, Bad fuel

Question 4

How much does it cost to fix P0300?

Accepted Answer

Typical repair cost: $50-$2,000+. If check engine light is FLASHING, misfires are active and can damage your catalytic converter. New spark plugs fix this more than half the time. Check fuel trims — highly positive = lean condition causing misfires.

P0300 — Random/Multiple Cylinder Misfire Detected

Don't guess — diagnose P0300 the right way

Common symptoms of P0300

Common causes of P0300

Repair cost & difficulty

Vehicles commonly affected

Related trouble codes