P0304 on Honda Pilot
Cylinder 4 Misfire Detected
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Honda Pilot context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P0304.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P0304 Means on Your Honda Pilot
P0304 is a diagnostic trouble code indicating: Cylinder 4 Misfire Detected. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real Honda Pilot Owner Reports
Source: NHTSA Complaints Database
"P0301 through p0304 honda engine misfire settlement honda manipulate the dealer to make false allegations and the vehicle they refuse to repair it. i wish to have the truth come to light how they refuse to service and take accountability to repair the vehicle."
"MIL comes on with DTCsP0301 through P0304 Car is available for inspection. Dealer confirmed along with independent service center."
"While driving vehicle obd shows code p0304. vehicle had poor acceleration while misfiring. took vehicle into honda dealership and they state a re-ring of four cylinders needed."
"The car has engine check light and traction lights are on. mechanic diagnosed the codes to match a recall which my vin is excluded even thought i am facing the same exact issue. piston misfiring and the engine can lock at any time causing an accident."
"My 2014 Honda Pilot has intermittent engine misfires (DTCs P0301–P0304) caused by piston ring failure. The defect leads to rough running, sudden loss of power, and unsafe driving conditions."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Honda Pilot
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.