DTC P0300: Random Misfire Detected & Any Combination of the Following; DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected; DTC P0305: No. 5 Cylinder Misfire Detected; DTC P0306: No. 6 Cylinder Misfire Detected
NOTE:
- If the misfiring is frequent enough to trigger detection of increased emission during 2 consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0306) will be stored.
- If the misfiring is frequent enough to damage the catalyst, the MIL will blink whenever the misfiring occurs, and DTC P0300 (and some combination of P0301 through P0306) will be stored. When the misfiring stops, the MIL will remain on.
- Troubleshoot the following DTCs first, if any of them were stored along with the random misfire DTC(s):
P0107, P0108, P1128, P1129: Manifold Absolute Pressure (MAP) Sensor
P0131, P0132: Primary Heated Oxygen Sensor (primary HO2S)
P0171, P0172: Fuel system
P0335, P0336: Crankshaft Position (CKP) sensor
P0401, P1491, P1498: Exhaust Gas Recirculation (EGR) system
P0505: Idle control system
P1259: VTEC system
P0340, P0341, P0365, P0366: Camshaft Position (CMP) sensor A/B
P1519: Idle Air Control (IAC) valve
- Test-drive the vehicle to verify the symptom.
- Find the symptom in the chart below, and do the related procedures in the order listed, until you find the cause.