P0456 on Your 2022 Infiniti Q50
A P0456 code on your 2022 Infiniti Q50 means the ECM has detected a very small leak—about 0.020 inches—in the EVAP system. Your Q50, powered by a 3.0L twin-turbocharged V6 (VR30DDTT) producing 300 or 400 hp depending on trim, uses Nissan/Infiniti's EVAP monitoring system.
At three-plus years old, your Q50 is entering the early-wear window for EVAP components.
Common Causes
- Gas cap seal wear (33%) — Three years degrades the seal. First suspect.
- Purge volume control valve seepage (23%) — Nissan/Infiniti's purge valve can develop internal leaks.
- EVAP line looseness (17%) — The Q50's sport sedan packaging means tight engine bay routing susceptible to heat.
- Canister vent control valve issue (14%) — The vent valve may develop wear.
- Charcoal canister damage (8%) — Road debris impacts.
- Fuel tank seal (5%) — Slow gasket degradation.
Diagnostic Steps
- Gas cap test — New OEM cap ($15–$30), clear code, monitor.
- Visual inspection — Check EVAP hoses, especially near the turbocharged engine's heat sources.
- Smoke test — Professional testing for exact leak location.
- CONSULT diagnostics — Infiniti dealer tool for detailed EVAP data.
- Component testing — Individual valve testing.
Repair Costs
- Gas cap: $15–$30 (DIY)
- Purge volume control valve: $150–$330
- Canister vent control valve: $160–$340
- EVAP hose repair: $90–$240
- Charcoal canister: $270–$510
Warranty Coverage
Your 2022 Q50 is covered under Infiniti's 4-year/60,000-mile basic warranty through 2026 and the federal emissions warranty for 8 years/80,000 miles through 2030.