Diagnosing P0455 on Your 2021 Honda CR-V
A P0455 on your 2021 Honda CR-V means the system detected a large EVAP leak—a breach of 0.040 inches or larger. Your 5th-generation CR-V is out of Honda's basic warranty but covered by the federal emissions warranty. The gas cap remains the most likely and cheapest fix.
Evidence Present
- Check engine light with P0455
- Faint fuel smell near the vehicle
- Gas cap seal showing early wear
- Emissions inspection failure
Suspects by Probability
- Gas Cap Seal (Very High Likelihood): After 4–5 years, the seal can wear. $10–$25 for OEM replacement.
- Canister Vent Shut Valve (Medium Likelihood): Sticking open. $150–$250 for replacement.
- EVAP Hose Crack (Medium Likelihood): Rubber vapor lines developing cracks. $80–$200.
- Bypass Solenoid Valve (Low Likelihood): Honda EVAP component. $120–$220.
- Fuel Sender O-Ring (Low Likelihood): Gasket 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 at a Honda dealer or independent shop to find 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 components through 2029. Contact your Honda dealer—this may be a free repair.
DIY Feasibility
Gas cap is easy. Vent shut valve is moderate difficulty—accessible near the fuel tank with basic tools. A smoke test requires professional equipment. Overall moderate DIY difficulty.
Safe to Drive?
Yes. P0455 doesn't affect the CR-V's 1.5T engine, AWD, or Hybrid powertrain.