Diagnosing P0455 on Your 2023 Honda Pilot
A P0455 on your 2023 Honda Pilot indicates a large EVAP system leak. Your all-new 4th-generation Pilot features a 3.5L V6 with a 10-speed automatic and is under full warranty. Before heading to the dealer, check the most common cause: your gas cap.
Symptoms
- Check engine light with P0455
- Possible faint fuel odor
- Gas cap not clicking properly
- EVAP readiness monitor not completing
Top Causes
- Gas Cap Seal (Very High Likelihood): Loose or defective cap seal. Tighten until it clicks. Warranty-covered if the seal is faulty.
- Canister Vent Shut Valve (Medium Likelihood): Honda's vent valve not sealing properly. Warranty-covered replacement.
- EVAP Hose Connection (Medium Likelihood): Factory assembly issue on the new platform. Warranty-covered.
- Bypass Solenoid Valve (Low Likelihood): Honda EVAP component. Warranty-covered.
- Fuel System Seal (Low Likelihood): Rare manufacturing defect. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If the light persists, take your Pilot to a Honda dealer. HDS diagnostics and smoke testing will find the leak—all free under warranty.
Warranty Coverage
Your 2023 Pilot is covered by Honda's 3-year/36,000-mile basic warranty, 5-year/60,000-mile powertrain warranty, and federal emissions warranty (8 years/80,000 miles). All EVAP repairs are free.
Safe to Drive?
Yes. P0455 doesn't affect the Pilot's 3.5L V6, 10-speed automatic, i-VTM4 AWD, or TrailSport capabilities.