Tracking Down the P0440 Code on Your 2022 Dodge Durango
The P0440 code on your 2022 Dodge Durango indicates an EVAP system malfunction detected by the PCM. Your three-row family SUV uses Stellantis' proven EVAP architecture. Let's investigate the clues and identify the most likely cause.
The 2022 Durango EVAP System
Available with the 3.6L Pentastar V6 or 5.7L HEMI V8, the Durango's EVAP components include:
- NVLD Module — Natural Vacuum Leak Detection passive leak testing
- Purge Solenoid Valve — Engine bay vapor routing to the intake
- Vent Valve — System sealing and atmospheric venting
- Charcoal Canister — Fuel vapor storage near the fuel tank
- Fuel Filler Cap — Screw-on with rubber gasket
Ranked Suspects
- Gas Cap Seal (29% of cases) — After 2–3 years, rubber gasket wear begins. Cost: $10–$22.
- NVLD Module (22%) — Vacuum switch degradation over time. Cost: $35–$80, $100–$230 with labor.
- Purge Solenoid Valve (20%) — Carbon buildup or heat-related wear. Cost: $25–$60, $90–$210 with labor.
- EVAP Hose Deterioration (13%) — Heat and vibration. Cost: $10–$35, $75–$190 with labor.
- Vent Valve (10%) — Undercarriage exposure. Cost: $30–$65, $90–$220 with labor.
- Charcoal Canister (6%) — Saturation from overfilling. Cost: $80–$200, $170–$350 installed.
Diagnostic Steps
- Gas Cap — Inspect, clean, reseat. Replace if worn ($10–$22). Clear code and monitor.
- Companion Codes — P0441 (purge flow), P0442 (small leak), P0456 (very small leak).
- NVLD Module — Under the vehicle, check connector and vacuum lines.
- Purge Valve — Engine bay, listen for clicking, test resistance.
- Smoke Test — $80–$150 for definitive leak detection.
Warranty and DIY
Warranty: The 3-year/36,000-mile warranty may still cover your 2022 Durango. The 5-year/60,000-mile powertrain warranty extends coverage. Verify with your dealer before paying.
For DIY: gas cap is easy, purge valve is moderate (engine bay access), NVLD and vent valve require getting under the SUV.
The Verdict
Your 2022 Durango's P0440 most likely traces to a gas cap, NVLD module, or purge valve. Check warranty coverage first — the 2022 may still be within the basic warranty window. Start with the gas cap and let companion codes guide the investigation.