Powertrain
generic / SAE
P0300
Random/Multiple Cylinder Misfire Detected
The ECU has detected misfires that are not concentrated on a single cylinder. The misfire monitor measures crankshaft acceleration after each combustion event; missing acceleration on multiple cylinders, or randomly across cylinders, triggers this code.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number3 / 00
Possible causes
- Worn spark plugs high
- Vacuum leak affecting all cylinders high
- Fuel pressure low medium
- Timing chain stretched (high mileage) low
Symptoms
- Check engine light on or flashing
- Rough idle and uneven running
- Power loss, hesitation under acceleration
- Increased fuel consumption
- Possible smell of unburned fuel from exhaust
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 50–1500 €
- Estimated time: 0.5–6 h
- Component: ignition coil
- Component: spark plug
- Component: fuel injector
- Component: intake manifold
- Component: timing chain
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012