Solving P0455 on Your 2021 Honda HR-V
A P0455 on your 2021 Honda HR-V indicates the EVAP system detected a large leak. Your 2nd-generation HR-V with the 1.8L engine and CVT is out of Honda's basic warranty but covered by the federal emissions warranty. The most likely fix is a $15 gas cap.
What You'll Notice
- Check engine light with P0455
- Possible faint fuel smell
- Gas cap seal wearing after 4–5 years
- Failed emissions test
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Worn rubber seal. $10–$25 for OEM replacement. The #1 cause.
- Canister Vent Shut Valve (Medium Likelihood): Honda's vent valve sticking open. $150–$250.
- EVAP Hose Crack (Medium Likelihood): Rubber vapor lines deteriorating. $80–$200.
- Bypass Solenoid Valve (Low Likelihood): Honda EVAP component. $120–$220.
- Fuel Sender Gasket (Low Likelihood): O-ring at the fuel pump module. $100–$250.
What to Do
Replace the gas cap with an OEM Honda cap ($10–$25). Clear the code and drive 2–3 cycles. If P0455 returns, get a smoke test to locate the leak.
Warranty Coverage
Honda's basic warranty (3 years/36,000 miles) has expired. The federal emissions warranty (8 years/80,000 miles) covers EVAP through 2029. Contact your dealer for coverage verification.
DIY Feasibility
Gas cap is trivial. The HR-V's compact size makes EVAP component access a bit tighter than larger Hondas, but the vent shut valve is still reachable. Moderate DIY difficulty.
Safe to Drive?
Yes. P0455 doesn't affect the HR-V's 1.8L engine, CVT, or AWD system.