P0300Cars & SUVs
ModerateP0300 — Random/multiple cylinder misfire detected
Multiple cylinders are misfiring without a single cylinder identified. This generic fault code needs a methodical diagnosis because several issues can stack at once.
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Likely causes
- Worn spark plugs, wires, or ignition coils across the board
- Fuel delivery problem (pump, filter, injectors)
- Faulty crankshaft or camshaft position sensor
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Recommended checks
- 1
Replace the full set of spark plugs and inspect the coils
- 2
Verify fuel pressure and injector condition
- 3
Review CKP/CMP sensor data with a professional scan tool
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Parts to replace
Spark plug set
Ignition coils
Fuel filter