DTC P0300: Random Misfire Detected: Condition

Powertrain Control Module (PCM) monitors Crankshaft Position (CKP) sensor input signal interval time. PCM detects a misfire in a specific cylinder by calculating change of CKP interval time for each cylinder. While engine is operating, PCM counts number of misfires that occur during 200 crankshaft revolutions and during 1000 crankshaft revolutions in order to calculate a misfire ratio for each crankshaft revolution. If misfire ratio exceeds a preprogrammed criteria, PCM determines that a misfire has occurred which can damage catalytic converter and will set a DTC. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• CKP sensor malfunction.
• Camshaft Position (CMP) sensor malfunction.
• Ignition coil malfunction.
• Secondary ignition system malfunction.
• Mass Airflow (MAF) sensor malfunction.
• Vacuum leak between MAF sensor and plenum chamber.
• Fuel pump malfunction.
• Fuel pressure regulator malfunction.
• Plugged fuel line.
• Plugged fuel filter.
• Fuel lines leaking.
• Purge solenoid valve malfunction.
• PCV valve malfunction.
• EGR system malfunction.
• Vacuum hoses damaged or improperly connected.
• Poor connector connection or wiring problems.