P0456 on Your 2022 Dodge Challenger
Your 2022 Dodge Challenger has flagged a P0456 code, meaning the PCM detected a very small leak (0.020-inch equivalent) in the EVAP system. The Challenger uses Stellantis's NVLD (Natural Vacuum Leak Detection) technology to verify the sealed fuel vapor system's integrity during every drive cycle.
From the V6 SXT to the supercharged Hellcat, every 2022 Challenger shares the same EVAP system design. This code is strictly an emissions concern—your Challenger's muscle car performance is completely untouched.
Common Causes
- Gas cap seal wear (33%) — Three years of use begins to degrade the rubber seal. This is always the first suspect.
- NVLD sensor issue (22%) — The NVLD unit can develop faults with age, though three years is relatively young for this component.
- EVAP hose or connection looseness (16%) — Thermal cycling and road vibration can work connections loose over time.
- Purge valve seepage (14%) — The engine-bay purge solenoid may not seal completely when closed.
- Charcoal canister issue (10%) — Road debris can damage the underbody-mounted canister.
- Fuel filler assembly seal (5%) — The filler neck seal can develop a slow leak path.
Diagnostic Steps
- New gas cap — The cheapest diagnostic test. Install a new cap ($15–$30), clear the code, and drive for a week.
- Visual inspection — Check EVAP hoses and connections for damage or looseness.
- Smoke test — Professional smoke testing reveals the exact leak location.
- wiTech scan — Stellantis dealer diagnostics provide detailed EVAP system data.
- Component check — Test NVLD sensor, purge valve, and vent valve individually.
Repair Costs
- Gas cap: $15–$30 (DIY)
- NVLD sensor: $200–$400
- EVAP hose repair: $100–$230
- Purge valve: $150–$320
- Charcoal canister: $280–$550
Warranty Coverage
Your 2022 Challenger's 3-year/36,000-mile basic warranty extends through 2025—check your mileage. The federal emissions warranty covers EVAP components for 8 years/80,000 miles through 2030, providing extended protection beyond the basic warranty. Contact your Dodge dealer to verify coverage.