OBD2 code P0300: Random/Multiple Cylinder Misfire Detected
The engine module detects misfire from crankshaft speed: a cylinder that does not fire gives no acceleration impulse.
Detected Root Component
Powertrain Component
Observed Symptoms
- Check engine light on, flashing at a catalyst-damaging rate
- Rough idle, jerking, vibration
- Loss of power, hesitation
- Smell of unburnt fuel, higher consumption
Possible Causes
- False air (vacuum leak, crankcase ventilation, intake gasket)
- Worn or wrong spark plugs on several cylinders, faulty ignition coils
- Fuel pressure too low or high, contaminated fuel
- Valve timing (stretched chain), valves, compression on several cylinders
- False detection: tone wheel or pulley, rough road, vibration, software
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Allumage / Bobine)
Allumage / Bobine
Photo d'illustration : Allumage / Bobine
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Frequently asked questions about code P0300
What does code P0300 mean? ▾
OBD2 code P0300: Random/Multiple Cylinder Misfire Detected. The engine module detects misfire from crankshaft speed: a cylinder that does not fire gives no acceleration impulse.
What are the symptoms of code P0300? ▾
Code P0300 may cause: Check engine light on, flashing at a catalyst-damaging rate, Rough idle, jerking, vibration, Loss of power, hesitation, Smell of unburnt fuel, higher consumption. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code P0300? ▾
The most common causes of code P0300 are: False air (vacuum leak, crankcase ventilation, intake gasket), Worn or wrong spark plugs on several cylinders, faulty ignition coils, Fuel pressure too low or high, contaminated fuel, Valve timing (stretched chain), valves, compression on several cylinders. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code P0300? ▾
Yes, code P0300 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code P0300? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: False air (vacuum leak, crankcase ventilation, intake gasket), Worn or wrong spark plugs on several cylinders, faulty ignition coils, Fuel pressure too low or high, contaminated fuel, Valve timing (stretched chain), valves, compression on several cylinders. Difficulty: Medium · Estimated time: 30-60min.