P0456 on Your 2022 Dodge Charger
A P0456 code on your 2022 Dodge Charger means the PCM has detected a very small leak—approximately 0.020 inches—in the evaporative emission control system. Your Charger uses Stellantis's NVLD (Natural Vacuum Leak Detection) technology to monitor the sealed EVAP system, and it's sensitive enough to catch even the tiniest breach.
Whether you're driving the 3.6L Pentastar V6 SXT, the 5.7L HEMI R/T, the 6.4L Scat Pack, or the supercharged Hellcat, the EVAP system is the same across all trims. This code is purely an emissions concern—your Charger's performance is completely unaffected.
Common Causes
- Gas cap issue (33%) — Three years of use can wear the seal, or the cap may simply not have been fully tightened after the last fill-up. Always the first clue to check.
- NVLD sensor malfunction (22%) — The Natural Vacuum Leak Detection sensor monitors EVAP integrity and can develop internal faults or cracks with age.
- EVAP line connection looseness (16%) — Thermal cycling from the powerful HEMI engines and road vibration can work hose connections loose over time.
- Purge valve seepage (14%) — The purge solenoid may develop a slight leak when commanded closed, causing marginal test results.
- Charcoal canister issue (10%) — Road debris or water intrusion can compromise the underbody-mounted canister.
- Fuel filler assembly seal (5%) — The filler neck or door seal can develop a slow leak path.
Diagnostic Steps
- Gas cap inspection — Check the seal for wear or debris. Replace if in doubt ($15–$30) and clear the code.
- Visual EVAP inspection — Check accessible vapor lines and connections for obvious damage or looseness.
- Smoke test — A professional smoke test fills the EVAP system with visible smoke to pinpoint the leak location.
- wiTech diagnostics — Stellantis's dealer tool provides real-time NVLD data and EVAP system monitoring.
- Component testing — Test the purge valve, vent valve, and NVLD sensor individually if the smoke test is inconclusive.
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 Charger's 3-year/36,000-mile Stellantis basic warranty extends through 2025—check your mileage. The federal emissions warranty covers EVAP components for 8 years/80,000 miles through 2030. Contact your dealer to verify coverage before paying out of pocket.