P0300 Honda Accord
Random/Multiple Cylinder Misfire Detected · Powertrain Code · High · Repair: Easy
What is P0300?
The ECM has detected misfires occurring in multiple or random cylinders. Common causes include worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure, or a failing catalytic converter.
When the Honda Accord triggers code P0300 (random/multiple cylinder misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Honda Accord.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Honda Accord.
Common Causes on Honda Accord
- Ignition coil failure on 1.5L turbo VTEC (Civic) or 2.0L turbo (Accord)
- Spark plug fouling from fuel dilution of oil on 1.5L turbo (cold climate TSB)
- Carbon buildup on intake valves from direct injection on 1.5T and 2.0T engines
- Fuel injector deposit buildup causing inconsistent spray pattern on 1.5L turbo
- Intake manifold gasket seepage causing minor vacuum leak on 2.0L naturally aspirated
Symptoms
- Rough idle with noticeable engine vibration
- Engine shaking or stumbling under load
- Loss of power during acceleration
- Check engine light flashing intermittently
- Poor fuel economy
- Hesitation or stumble on acceleration
Notes for Honda Accord
The 1.5L turbo fuel dilution issue is most prevalent in cold climates with short driving distances.