P0300 – Random or Multiple Misfire Detected The most common engine misfire-related OBD2 trouble codes are: For example, code P3004 indicates a misfire in cylinder 4. Misfire codes start with “P0300,” and end with the number of the misfiring cylinder. You’ll be able to tell which cylinder misfired based on the OBD2 trouble code sent to the ECM or PCM. ‘P0300’ OBD2 fault codes indicate cylinder misfires These sensors send signals to the engine or powertrain control module (ECM or PCM) if a cylinder misfires. When you have an engine misfire, you may notice your vehicle is hesitating, has a loss of power, or is even “sputtering” when you press down on the accelerator. The knock sensor, crankshaft, and camshaft sensors monitor the combustion process. Exhaust stroke: Once the fuel has burned, the piston starts to move back up to its original position, opening the exhaust valve, through which exhaust is released.The expanding heat and pressure drive the piston back downward in its bore. Power stroke: A spark plug fires (or “sparks”), igniting the air-fuel mixture.Compression stroke: The upward moving piston compresses the air-fuel mixture.Intake stroke: An air-fuel mixture is drawn into a cylinder through the intake valve by the downward moving piston.In a four-stroke internal combustion engine, this process involves these four repeating steps, or strokes: What Is a Misfire?Ī misfire is when a part of the combustion process goes wrong in one of your car’s cylinders. Watch more automotive DIY videos like this in our video library.
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