P0456 on Your 2022 Genesis GV80
A P0456 code on your 2022 Genesis GV80 means the ECM has detected a very small leak (0.020-inch equivalent) in the EVAP system. The GV80, available with a 2.5L turbo I4 or 3.5L twin-turbo V6, uses Hyundai/Genesis's EVAP monitoring system.
Common Causes
- Gas cap seal wear (33%) — Three years degrades the seal.
- Purge control solenoid valve seepage (23%) — Hyundai/Genesis's purge valve can develop slight leaks.
- EVAP line looseness (17%) — Heat and vibration loosen connections.
- Canister close valve issue (14%) — Vent valve wear.
- Charcoal canister damage (8%) — Road debris.
- Fuel tank seal (5%) — Slow degradation.
Diagnostic Steps
- Gas cap test — New OEM cap ($12–$30), clear code, monitor.
- Smoke test — Professional diagnosis.
- GDS diagnostics — Genesis dealer tool.
- Component testing — Valve checks.
Repair Costs
- Gas cap: $12–$30 (DIY)
- Purge control solenoid: $140–$310
- Canister close valve: $150–$330
- EVAP hose repair: $90–$230
- Charcoal canister: $260–$510
Warranty
Your 2022 GV80 is covered under Genesis's 5-year/60,000-mile basic warranty through 2027 and federal emissions for 8 years/80,000 miles through 2030.