Investigating P0446 on Your 2020 Dodge Charger
A P0446 code on your 2020 Dodge Charger indicates an EVAP vent control circuit malfunction. The Charger uses Stellantis' Natural Vacuum Leak Detection (NVLD) system on the LX/LD platform, whether you have the 3.6L Pentastar V6, 5.7L HEMI V8, or 6.4L HEMI V8. The NVLD system monitors EVAP integrity using vacuum decay rather than pressurization, making it unique among automakers.
The basic warranty (3yr/36k) has expired, but the federal emissions warranty (8yr/80k) likely still covers EVAP components through 2028. Check your mileage.
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 of the vehicle
Top Suspects
- NVLD Switch/Seal Failure (High Likelihood): The NVLD unit's internal switch or seal degrades over time, causing false vent circuit faults. Replacement costs $150–$280.
- Purge Solenoid Malfunction (High Likelihood): The purge solenoid sticks open or closed, disrupting EVAP flow and triggering vent circuit monitoring errors. Replacement runs $120–$230.
- NVLD Wiring or Connector Corrosion (Medium Likelihood): The underbody-mounted NVLD unit's wiring and connector corrode from road exposure. Repair costs $80–$180.
- Charcoal Canister Issues (Medium Likelihood): Canister saturation from fuel vapor overload, especially with HEMI engines that produce significant fuel vapors. Replacement runs $220–$400.
- Gas Cap Seal (Low Likelihood): Worn or cracked seal allows air ingress. Replacement is $10–$25.
How to Investigate
Start with a full code scan including pending and history codes. The NVLD system is Stellantis-specific—a wiTECH scan at a dealer provides the most detailed EVAP diagnostics including NVLD switch status and commanded tests. For DIY, inspect the NVLD unit connector under the vehicle and check the gas cap seal first.
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, have a Dodge dealer handle this free. Out of warranty, expect $120–$400 depending on the root cause.
Safe to Drive?
Yes. P0446 doesn't affect your Charger's engine power, HEMI performance, transmission, or any driving dynamics. It's purely an emissions circuit code.