Understanding P0456 on Your 2022 Dodge Durango
A P0456 code on your 2022 Dodge Durango indicates the PCM has detected a very small leak in the EVAP system—a breach of approximately 0.020 inches. Your Durango uses Stellantis's NVLD (Natural Vacuum Leak Detection) sensor to verify the sealed fuel vapor system's integrity during each drive cycle.
Whether your 2022 Durango is equipped with the 3.6L Pentastar V6, the 5.7L HEMI V8, or the 6.4L SRT V8, the EVAP system is the same across all trims. This code is purely an emissions concern—your SUV's performance and family-hauling capability remain unaffected.
Common Causes
- Gas cap issue (33%) — Three years of use can wear the seal, or the cap may not have been fully tightened. The primary suspect in every investigation.
- NVLD sensor malfunction (22%) — The NVLD sensor monitors EVAP integrity and can develop faults with age.
- EVAP line looseness (16%) — Thermal cycling and road vibration over three years can work connections loose.
- Purge valve seepage (14%) — The purge solenoid may not seal completely when commanded closed.
- Charcoal canister issue (10%) — Road debris can damage the underbody canister.
- Fuel filler seal (5%) — The filler neck or assembly seal can develop a slow leak.
Diagnostic Steps
- Gas cap test — Replace with a new cap ($15–$30), clear the code, and monitor.
- Visual inspection — Check accessible EVAP hoses and connections.
- Smoke test — Professional smoke testing pinpoints the exact leak.
- wiTech diagnostics — Stellantis dealer tool provides detailed EVAP system data.
- Component testing — Individual testing of NVLD, purge valve, and vent valve.
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 Durango's 3-year/36,000-mile basic warranty extends through 2025—check your mileage to see if you're still covered. The federal emissions warranty protects EVAP components for 8 years/80,000 miles through 2030. Always verify warranty eligibility before paying out of pocket.