P0300 Honda Hr-V
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 Hr-V 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 Hr-V.
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 Hr-V.
Common Causes on Honda Hr-V
- Ignition coil failure on 1.5L turbo (CR-V/HR-V) or 3.5L V6 (Pilot)
- Fuel dilution of engine oil on 1.5L turbo CR-V causing plug fouling (2017-2020 TSB)
- Carbon buildup on intake valves from direct injection on 1.5L turbo
- Spark plug gap erosion on 3.5L V6 beyond 105k-mile service interval
- Intake manifold runner control valve failure on 3.5L i-VTEC V6 Pilot
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 Hr-V
Honda issued ECU calibration updates to reduce fuel dilution on 2017-2020 CR-V 1.5T models.