Investigating P0446 on Your 2020 Dodge Durango
A P0446 code on your 2020 Dodge Durango points to an EVAP vent control circuit malfunction. The Durango uses Stellantis' NVLD (Natural Vacuum Leak Detection) system on the WD platform, whether equipped with the 3.6L Pentastar V6 or the 5.7L HEMI V8. The NVLD monitors EVAP integrity through vacuum decay rather than pressurization.
The basic warranty (3yr/36k) has expired, but the federal emissions warranty (8yr/80k) likely still covers EVAP components through 2028. Check your mileage to confirm.
Clues and Symptoms
- Check engine light illuminated with P0446
- Fuel fill difficulty or slow pumping
- EVAP readiness monitor not completing
- Possible fuel odor near the rear
Top Suspects
- NVLD Switch/Seal Failure (High Likelihood): The NVLD unit's internal switch or seal degrades with age, causing circuit faults. Replacement costs $150–$280.
- Purge Solenoid Malfunction (High Likelihood): The purge solenoid sticks open or closed, disrupting system flow. HEMI-equipped Durangos produce more fuel vapors that stress this component. Replacement runs $120–$240.
- NVLD Wiring or Connector Corrosion (Medium Likelihood): The underbody-mounted NVLD unit's wiring is exposed to road spray. Repair costs $80–$180.
- Charcoal Canister Saturation (Medium Likelihood): Five years of use can saturate the canister, especially with the HEMI's higher vapor output. Replacement runs $220–$400.
- Gas Cap Seal (Low Likelihood): Worn or cracked seal. Replacement is $10–$25.
How to Investigate
Start with a full code scan including pending and history codes. The NVLD system is Stellantis-specific—wiTECH diagnostics at a dealer provide NVLD switch status and commanded tests. For DIY, check the gas cap first, then inspect the NVLD connector under the vehicle for corrosion.
Warranty and Cost
The basic warranty has expired, but the federal emissions warranty (8 years/80,000 miles) covers EVAP components through 2028. If under 80k miles, a Dodge dealer should handle this free. Out of warranty, expect $120–$400 depending on the cause.
Safe to Drive?
Yes. P0446 doesn't affect your Durango's engine power, transmission, AWD system, towing capacity, or safety features. Full SUV capability is maintained.