P0456 on Your New 2024 Dodge Durango
A P0456 code on your 2024 Dodge Durango indicates the PCM has detected a very small leak (0.020-inch equivalent) in the EVAP system. While a check engine light on a new vehicle is unwelcome, P0456 on a 2024 model is typically minor and fully covered under warranty.
The 2024 Durango continues with the 3.6L Pentastar V6 or 5.7L HEMI V8, using Stellantis's NVLD (Natural Vacuum Leak Detection) system to monitor EVAP integrity. The system must be perfectly sealed to pass the onboard monitor, and even the smallest anomaly triggers this code.
Likely Causes
- Gas cap not fully tightened (35%) — The most common cause on any vehicle, new or old. Ensure the cap clicks firmly.
- Software calibration sensitivity (22%) — Stellantis may have PCM calibration updates that adjust EVAP monitor thresholds.
- Factory EVAP connection variance (18%) — Quick-connect fittings may not be 100% seated from the assembly line.
- NVLD sensor variance (12%) — A marginal NVLD unit can trigger borderline readings.
- Purge valve irregularity (8%) — A slightly out-of-spec purge solenoid.
- New seal break-in (5%) — Fresh seals may need thermal cycling to fully bed in.
What to Do
- Check the gas cap — Remove, inspect, reinstall firmly.
- Schedule a dealer visit — Full warranty coverage means $0 cost. The dealer uses wiTech and checks for TSBs.
- Software update — Pending PCM calibrations may resolve the issue.
- Physical repair if needed — Smoke test and component replacement under warranty.
Cost
- Under warranty: $0—covered through 2027 (basic) and 2032 (emissions)
- Gas cap (DIY): $15–$30
Warranty
Your 2024 Durango carries Stellantis's 3-year/36,000-mile basic warranty through 2027 and the federal emissions warranty for 8 years/80,000 miles through 2032. There is no reason to pay out of pocket. Let the dealer handle diagnosis and repair.