Investigating P0455 on Your 2024 Honda Accord
A P0455 code on your 2024 Honda Accord indicates the EVAP system detected a large leak—a breach equivalent to 0.040 inches or larger. Your 11th-generation Accord is under full warranty, so this is a no-cost repair. But before scheduling a dealer visit, check the simplest cause first.
Symptoms Present
- Check engine light with P0455
- Possible faint fuel odor
- Gas cap may not click when tightened
- EVAP monitor not completing
Top Causes
- Gas Cap Seal (Very High Likelihood): Loose or defective gas cap is the #1 P0455 cause. Tighten until it clicks. Warranty-covered if the seal is defective.
- Canister Vent Shut Valve (Medium Likelihood): Honda's vent valve stuck open. Warranty-covered replacement.
- EVAP Hose Connection (Medium Likelihood): Factory assembly issue—loose vapor line. Warranty-covered.
- Bypass Solenoid Valve (Low Likelihood): Honda-specific EVAP component. Warranty-covered.
- Fuel Tank Seal (Low Likelihood): Rare manufacturing defect. Warranty-covered.
What to Do
Tighten your gas cap firmly until it clicks. Drive for 2–3 days. If the light goes off, the cap was loose. If it stays on, take your Accord to a Honda dealer—HDS diagnostics and smoke testing will locate the leak, and all repairs are free under warranty.
Full Warranty Coverage
Your 2024 Accord is covered by Honda's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. The federal emissions warranty adds 8 years/80,000 miles for EVAP components. All diagnosis and repair is free.
Safe to Drive?
Yes. P0455 is a vapor containment issue. Your Accord's engine, CVT, and all driving systems are unaffected.