Tracking Down P0455 on Your 2022 Honda Accord
A P0455 code on your 2022 Honda Accord signals a large EVAP system leak—equivalent to a 0.040-inch or larger opening. As the final year of the 10th-generation Accord (CV platform), your car may still be within Honda's basic warranty window. Start with the gas cap—it's the most common cause.
What You May Notice
- Check engine light with P0455
- Faint fuel odor near the rear
- Gas cap not clicking when tightened
- Emissions test failure
Causes by Likelihood
- Gas Cap Seal (Very High Likelihood): Loose, worn, or defective seal. Tighten or replace ($10–$25). The #1 P0455 cause on any Honda.
- Canister Vent Shut Valve (Medium Likelihood): Honda's vent valve stuck open. $150–$250 if out of warranty.
- EVAP Vapor Hose (Medium Likelihood): Cracked or disconnected line. $80–$200 for repair.
- Bypass Solenoid Valve (Low Likelihood): Honda-specific EVAP component. $120–$220.
- Charcoal Canister (Low Likelihood): Saturated from fuel overfilling. $200–$350.
Diagnostic Steps
Tighten or replace the gas cap first. Clear the code and drive for 2–3 days. If P0455 returns, a Honda dealer will use HDS diagnostics and a smoke test to pinpoint the leak location.
Warranty Status
Honda's 3-year/36,000-mile basic warranty runs through 2025—check your mileage. The federal emissions warranty (8 years/80,000 miles) covers EVAP components through 2030 regardless. Contact your dealer to confirm coverage.
DIY Options
Gas cap replacement is trivial. Beyond that, the canister vent shut valve is accessible near the fuel tank. Moderate DIY difficulty with basic hand tools and an OBD-II scanner.
Safe to Drive?
Yes. P0455 is a vapor leak, not a performance or safety issue. Your Accord's 1.5T or 2.0T engine runs normally.