Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0300: Engine Misfire Detected: Description
PCM times the interval between each pulse of the CKP sensor and compares each time interval with the other 7 to determine when an excessive change in crankshaft speed has occurred.
This pulse is generated from a 4X reluctor wheel located on front of crankshaft. If crankshaft speed is less than an expected amount, PCM will increase amount of fuel needed to correct misfire. If amount of fuel exceeds the calibrated value, PCM will interpret this as a misfire and set the DTC. This misfire diagnostic is used only to identify a weak cylinder needing additional fuel.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.