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DTC P0301-P0304: Cylinder Misfire Detected

WARNING: This page is about a different car, the 2000 Honda Civic. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If DTCs P0107, P0108, P0131, P0132, P0171, P0172, P0335, P0336, P0401, P1128, P1129, P1359, P1361, P1362, P1381, P1382, P1491 and/or P1498 are displayed, trouble shoot P0301-P0304 last. Listed DTCs do not apply to all models.

If misfiring is frequent enough to trigger detection of increased emission 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.

  1. If DTCs P0301, P0302, P0303, and/or P0304 is set, check for:
    • Fuel injector that is clogged or, leaking fuel or air.
    • Open or shorted fuel injector circuit.
    • Spark plug carbon deposits, fouling or other malfunction.
    • Open or short in ignition wire.
    • Distributor malfunction.
    • Low engine compression.
    • Valves incorrectly adjusted.
    • VTEC system malfunction (D16Y5 or D16Y8 engine).
    • Heated Oxygen Sensor (HO2S) or HO2S circuit malfunction.

    Repair as necessary. If no problems are found, go to next step.

  2. Start engine and listen for clicking sound at fuel injector in suspect cylinder. If injector clicks, go to next step. If injector does not click, check for open or short in wiring harness between fuel injector and PCM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary. If wiring is okay, replace fuel injector and recheck. If injector still does not click, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.
  3. Using scan tool, check and record freeze frame data. Perform PCM reset procedure. If there is no freeze data of misfiring, perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DTCS in SELF-DIAGNOSTICS - INTRODUCTION article. Exchange spark plug from misfiring cylinder with one from another cylinder. Connect SCS service connector. Test drive vehicle several times in range of freeze frame data or under various conditions to duplicate malfunction if freeze frame data is not available.
  4. Using scan tool, check for DTCs. If DTC P0301, P0302, P0303, or P0304 is indicated, go to next step. If DTCs are not indicated, misfire condition is intermittent due to spark plug fouling. Plugs are firing properly at this time.
  5. If misfiring occurs in other cylinder whose spark plug was exchanged, replace spark plugs. If misfiring does not occur in other cylinder whose spark plug was exchanged, exchange fuel injector with one from another cylinder. Start engine and allow it to idle for 2 minutes.
  6. Test drive vehicle several times in range of freeze frame data. If there is no freeze frame data of misfiring, test drive vehicle under various conditions to duplicate malfunction.
  7. If DTC P0301, P0302, P0303, or P0304 is indicated, go to next step. If DTCs are not indicated, misfire condition is intermittent due to bad contact in fuel injector connector. Injectors are operating properly at this time.
  8. If misfire occurs in cylinder whose injector was exchanged, replace faulty fuel injector. If misfire does not occur in other cylinder whose fuel injector was exchanged, check cylinder leak down, engine compression and Crankshaft Speed Fluctuation (CKF) sensor. Repair as necessary.
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