Tracking Down P0455 on Your 2020 Dodge Durango
A P0455 on your 2020 Durango (WD platform) means a large EVAP system leak. Whether you have the 3.6L Pentastar V6 or 5.7L HEMI V8, the EVAP system uses Stellantis NVLD technology. Basic warranty has expired, but federal emissions coverage protects you through 2028.
Symptoms
- Check engine light with P0455
- Fuel odor possible, especially when parked
- Gas cap not seating correctly
- Emissions test failure
Top Suspects
- Gas Cap Seal (Very High Likelihood): Aged after 5+ years. $15–$25 for Mopar replacement.
- NVLD Unit (Medium Likelihood): Natural Vacuum Leak Detection module wear. $150–$300 installed.
- Purge Solenoid (Medium Likelihood): Stuck or leaking. $100–$250 installed.
- EVAP Canister (Low-Medium Likelihood): Charcoal saturation from overfilling fuel. $200–$400 installed.
- Fuel Tank Pressure Sensor (Low Likelihood): Incorrect readings. $120–$280 installed.
Diagnosis
Replace the gas cap first—it's the cheapest and most common fix. If P0455 returns after 2–3 drive cycles, a smoke test ($80–$150) will reveal the leak source.
Warranty
Chrysler's 3yr/36k warranty expired in 2023. Federal emissions (8yr/80k) covers EVAP through 2028—check your mileage.
Safe to Drive?
Yes. P0455 doesn't affect HEMI power, AWD, towing capacity, or any Durango features.