P0300High urgency

Random / Multiple Cylinder Misfire Detected

Powertrain · Ignition & Fuel System

⛔ Stop driving if misfires are constant — catalytic converter damage risk.
What this means

Multiple cylinders are misfiring randomly, causing rough idle, poor acceleration, and potential catalytic converter damage if left untreated. The misfire pattern is random across cylinders rather than isolated to one, which typically points to a shared cause like spark plugs, fuel delivery, or engine compression.

Likely causes
  • Worn or fouled spark plugsMost common
  • Failing ignition coilsMost common
  • Clogged or failing fuel injectorsCommon
  • Low compression (worn rings or valves)Less common
Estimated repair cost
Spark plug set replacement$80 – $250
Ignition coil(s) replacement$150 – $400
Fuel injector cleaning or replace$200 – $600
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Frequently asked questions

What does P0300 mean?

Multiple cylinders are misfiring randomly, causing rough idle, poor acceleration, and potential catalytic converter damage if left untreated. The misfire pattern is random across cylinders rather than isolated to one, which typically points to a shared cause like spark plugs, fuel delivery, or engine compression.

Is P0300 serious?

Stop driving if misfires are constant — catalytic converter damage risk.

How much does it cost to fix P0300?

Repair costs for P0300 range from $80 – $250 depending on the root cause and your vehicle.

Can I drive with P0300?

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