P0300 — Random/Multiple Cylinder Misfire Detected
Reviewed1 source
1 source
- Official data (NHTSA)official_feed
What P0300 means
Avoid long trips
The ECU detects misfires in more than one cylinder based on crankshaft rotation irregularity (unlike P0301–P0304, which point to a specific cylinder).
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Watch: short explainer
What does the P0300 code mean?
Watch on YouTubeCommon causes
- Worn spark plugs
- Vacuum leak (intake air leak)
- Worn or failing ignition coils
- Intake valve carbon buildup (direct injection)
- Failed ignition coil
Symptoms
- Check-engine light flashing under hard acceleration
- Misfire under load
- Engine shaking at idle
- Повышенный расход топлива
- Random misfire codes across multiple cylinders
- Fluctuating idle RPM
- Rough idle vibration
- Rough idle
- Loss of power
- Hesitation on acceleration
- Engine misfiring
What to check first
- Read the full code list — any cylinder-specific P030X present
- Inspect spark plugs for fouling/oil/gap
- Swap ignition coils between cylinders to isolate
- Check whether onset correlates with a recent refuel or engine wash
$180.00 – $450.00
| Estimated repair cost range | USD |
|---|---|
| Low | $180.00 |
| Typical | $280.00 |
| High | $450.00 |
Editorial estimate — no owner reports yet