P0300 - Random/Multiple Cylinder Misfire Detected
Plain-English meaning
The engine control module (ECM) has detected random or multiple cylinder misfires occurring in the engine.
What to check first
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What not to replace yet
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Stop driving when
If the engine is severely misfiring causing loss of power or stalling, or if there is a strong smell of fuel indicating possible fuel leak, stop driving immediately to prevent damage or safety hazards.
Related symptoms
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Owner steps
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Likely causes
Faulty spark plugs or spark plug wires
Ignition coil problems
Fuel delivery issues (clogged fuel injectors, weak fuel pump)
Vacuum leaks
Faulty or dirty mass airflow sensor
Engine mechanical problems (low compression, timing issues)
Faulty oxygen sensors or other emission-related sensors
Shop steps
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Follow-up questions
When did you first notice the issue?
Are there any other warning lights illuminated on the dashboard?
Have any recent repairs or maintenance been performed on the vehicle?
Is the engine misfire constant or intermittent?
Have you noticed any unusual noises or smells from the engine?