DTC P0300: Random Misfire Detected: Notes

NOTE: If DTCs P0107, P0108, P0171, P0172, P0505, P1128, P1129, P1336, P1337, P1361, P1362, P1381, P1382, and/or P1508 are indicated, trouble shoot misfire DTCs last.

If misfiring is frequent enough to trigger detection of increased emissions during 2 consecutive driving cycles, Malfunction Indicator Light (MIL) will illuminate, and DTC P0300 and some combination of P0301-P0304 will be stored in memory. If misfiring is frequent enough to damage catalyst, MIL will blink whenever misfiring occurs, and DTC P0300 and some combination of P0301-P0304 will be stored in memory. When misfiring stops, MIL will still remain on.

If DTCs P0300 and some of DTCs P0301, P0302, P0303, and/or P0304 is set, check for:
- Insufficient fuel pressure or inadequate fuel flow.
- Clogging, blocked or leaking fuel line.
- Clogging fuel filter.
- Stuck open fuel pressure regulator.
- Distributor malfunction.
- An open or shorting ignition coil wire.
- Ignition Control Module (ICM) malfunction.
- Carbon deposits on valves.
- Low engine compression.
- Fuel octane level less than specification or very low fuel level.
Repair as necessary. If no problems are found, go to next step.
Test drive vehicle to verify symptom. Perform inspection and repair procedures according to symptom.