The P0304 diagnostic trouble code on your 2023 Honda Ridgeline indicates the powertrain control module has detected consistent misfires in cylinder 4. The refreshed Ridgeline continues with the proven 3.5L V6.
2023 Ridgeline Powertrain
The 2023 Ridgeline uses the J35Y6 3.5L V6 producing 280 horsepower. The refreshed model features updated styling while maintaining the reliable V6 architecture. Cylinder 4 is on the rear bank.
Typical Causes
- Ignition Coil Problems: Coil-on-plug failures
- Spark Plug Condition: Honda-specific requirements
- VCM Operation: Cylinder deactivation
- Fuel Injector Issues: Direct injection deposits
- Carbon Accumulation: GDI valve deposits
Diagnostic Process
Use Honda diagnostic equipment for detailed access. Monitor VCM operation and misfire data. Test ignition components systematically.
Repair Recommendations
Replace faulty ignition coils with OEM parts. Install properly specified spark plugs. Dealer service for warranty coverage.