Following P0456 Clues on Your 2021 Honda HR-V
A P0456 on your 2021 HR-V (2nd generation) means a very small EVAP leak. The 1.8L I4 uses Honda's canister vent shut valve EVAP system. Basic warranty likely expired, but emissions coverage continues.
Evidence
- Check engine light on
- P0456 stored
- No drivability symptoms
- Gas cap may be slightly worn
Suspects by Likelihood
- Gas Cap Seal (Very High Likelihood): Minor wear. $10–$20.
- Canister Vent Shut Valve (Medium Likelihood): Honda valve. $100–$230 installed.
- Purge Solenoid (Low-Medium Likelihood): Slight leak. $90–$210 installed.
- EVAP Hose (Low Likelihood): Connection. $80–$170.
- FTP Sensor (Low Likelihood): Sensitivity. $110–$250 installed.
Diagnosis
New gas cap first. If P0456 persists, a sensitive smoke test or HDS diagnostics will find the very small leak.
Warranty
Honda's 3yr/36k likely expired in 2024. Federal emissions (8yr/80k) covers EVAP through 2029.
Safe to Drive?
Yes. P0456 has zero impact on the engine or any features.