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The P0300 is a Diagnostic Trouble Code (DTC) for "Random or Multiple Cylinder Misfire" from a vehicle's On-Board Diagnostics-II (OBD-II) system. Also include tags for your vehicle's make and model. If your question also relates to proper use of OBD-II scan tools, include the obd-ii tag too.

For questions regarding the OBD-II DTC code which is for "Random or Multiple Misfires" and can be caused by a variety of causes, including:

  • Spark plug, plug wiring, or coil pack problems
  • Throttle body or fuel injector dirty
  • Poor compression

This a generic DTC. There are codes for each cylinder from 1 through 12, such as for Cylinder #1.

Further reading can be found at: