Following P0456 Clues on Your 2021 Honda CR-V
A P0456 on your 2021 CR-V (5th generation) means a very small EVAP leak. The 1.5L turbo or hybrid uses Honda's canister vent shut valve EVAP system. Basic warranty may still apply.
Evidence
- Check engine light on
- P0456 stored
- No drivability issues
- Gas cap may be slightly worn
Suspects Ranked
- Gas Cap Seal (Very High Likelihood): Minor wear. $0–$20.
- Canister Vent Shut Valve (Medium Likelihood): Honda valve. $100–$240 installed.
- Purge Solenoid (Low-Medium Likelihood): Slight leak. $90–$220 installed.
- EVAP Hose (Low Likelihood): Connection. $80–$180.
- FTP Sensor (Low Likelihood): Sensitivity. $120–$260 installed.
Diagnosis
New gas cap first. If P0456 persists, your Honda dealer with HDS or a sensitive smoke test will find the very small leak.
Warranty
Honda's 3yr/36k warranty likely expired in 2024. Federal emissions (8yr/80k) covers EVAP through 2029.
Safe to Drive?
Yes. P0456 has no performance or safety impact.