P0456 on Your 2022 Infiniti QX60
A P0456 code on your 2022 Infiniti QX60 means the ECM has detected a very small leak—about 0.020 inches—in the EVAP system. The all-new 2022 QX60, built on Nissan's platform and powered by a 3.5L V6, uses Nissan/Infiniti's EVAP monitoring system to verify fuel vapor containment.
As the first year of the redesigned QX60, your 2022 model uses a modern EVAP system with electronic controls. At three-plus years old, early-wear issues are possible alongside simpler causes.
Common Causes
- Gas cap seal wear (33%) — Three years of fueling degrades the seal. Check first.
- Purge volume control valve (PCV) seepage (23%) — Nissan/Infiniti's purge valve can develop slight internal leaks with use.
- EVAP line looseness (17%) — Quick-connect fittings and hoses can loosen from vibration and thermal cycling.
- Canister vent control valve issue (14%) — The vent valve may develop wear affecting its seal.
- Charcoal canister damage (8%) — Road debris impacts on the underbody canister.
- Fuel tank seal (5%) — Gradual gasket degradation.
Diagnostic Steps
- Gas cap test — New OEM cap ($15–$30), clear code, drive for a week.
- Visual inspection — Check EVAP hoses and connections.
- Smoke test — Professional testing pinpoints the leak.
- CONSULT diagnostics — Nissan/Infiniti's dealer tool provides detailed EVAP data.
- Component testing — Individual purge and vent valve checks.
Repair Costs
- Gas cap: $15–$30 (DIY)
- Purge volume control valve: $150–$330
- Canister vent control valve: $160–$340
- EVAP hose repair: $90–$230
- Charcoal canister: $270–$520
Warranty Coverage
Your 2022 QX60 is covered under Infiniti's 4-year/60,000-mile basic warranty through 2026. The federal emissions warranty extends EVAP coverage to 8 years/80,000 miles through 2030. Infiniti's warranty is among the best in the luxury segment—verify eligibility with your dealer.