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 Descriptions
- DTC P0300: Random Misfire Detected
DTC P0300 indicates a fluctuation is detected by PCM from data received from CKP sensor. Possible causes are as follows:- Incorrect spark plugs.
- Low cylinder compression.
- Incorrect fuel pressure.
- Fuel injector circuit is open or shorted.
- Faulty fuel injectors.
- Intake air leaks.
- Low fuel volume.
- Secondary ignition circuit is open or shorted.
- Damaged flex-plate (flywheel).
- Faulty HO2S-11.
- Incorrect distributor rotor
For DTC P0300, perform a cylinder balance test. All cylinders should respond.
- DTC P0301-P0306: Corresponding Cylinder Misfire Detected
Crankshaft Position (CKP) sensor circuit is monitored by PCM. From data received from CKP sensor, test fails if a fluctuation is detected by PCM when cylinder No. 1, 2, 3, 4, 5 or 6 is to fire. Possible causes are as follows:- Incorrect spark plug.
- Low cylinder compression.
- Incorrect fuel pressure.
- Fuel injector circuit is open or shorted.
- Faulty fuel Injector.
- Intake air leaks.
- Low fuel volume.
- Secondary ignition circuit is open or shorted.
- Damaged flex-plate (flywheel).
- Faulty HO2S-11.
- Incorrect distributor rotor
For DTCs P0301-P0306, perform a cylinder balance test. Corresponding cylinder to DTC should respond.
Use the Manual With the Right Hardware
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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.
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