P0300

DTC P0300: Random Misfire and Any Combination of the Following:
DTC P0301: No.1 Cylinder Misfire
DTC P0302: No.2 Cylinder Misfire
DTC P0303: No.3 Cylinder Misfire
DTC P0304: No.4 Cylinder Misfire

NOTE:
- If the misfiring is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0304) 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 P0304) will be stored. When the misfiring stops, the MIL will remain on.

1. 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
P0171, P0172: Fuel system
P0335, P0336: Crankshaft Position (CKP) sensor
P0505: Idle control system
P1259: VTEC system
P1361, P1362: Top Dead Center (TDC) sensor
P1519: Idle Air Control (IAC) valve

2. Test-drive the vehicle to verify the symptom.




3. Find the symptom in the chart given, and do the related procedures and checks, in the order listed, until you find the cause.