P0456 on Your 2022 Acura Integra
A P0456 code on your 2022 Acura Integra means the PCM has detected a very small leak (0.020-inch equivalent) in the EVAP system. The revived Integra, built on Honda's Civic platform with a 1.5L turbocharged four-cylinder, uses Honda/Acura's EVAP monitoring system with a canister vent shut valve.
As one of the first model years of the revived Integra, your 2022 may occasionally encounter early-life calibration sensitivity. At three-plus years old, minor wear is also entering the picture.
Common Causes
- Gas cap seal wear (33%) — Three years of fueling wears the seal. Check first.
- Canister vent shut valve malfunction (23%) — Honda/Acura's vent control can develop faults with age.
- Purge valve seepage (18%) — The purge solenoid may develop a slight internal leak.
- EVAP line looseness (14%) — Connections loosened by vibration and thermal cycling.
- Charcoal canister issue (7%) — Road debris damage.
- Fuel tank seal (5%) — Gradual gasket degradation.
Diagnostic Steps
- Gas cap test — New OEM cap ($12–$25), clear code, drive for a week.
- Visual inspection — Check accessible EVAP components.
- Smoke test — Professional diagnosis for elusive leaks.
- i-HDS diagnostics — Acura dealer tool for EVAP system data.
- Component check — Test vent shut valve and purge valve.
Repair Costs
- Gas cap: $12–$25 (DIY)
- Canister vent shut valve: $160–$340
- Purge valve: $130–$290
- EVAP hose repair: $80–$200
- Charcoal canister: $250–$470
Warranty Coverage
Your 2022 Integra is covered under Acura's 4-year/50,000-mile basic warranty through 2026. The federal emissions warranty extends EVAP coverage to 8 years/80,000 miles through 2030. Check with your dealer before paying out of pocket.