Investigating the P0440 on Your 2024 Ram 3500
A P0440 code on your brand-new 2024 Ram 3500 signals a malfunction in the evaporative emission control (EVAP) system. On Ram's most capable truck, this code is typically a minor issue that's fully covered under your factory warranty.
Gasoline models only: The P0440 applies to the 6.4L HEMI V8 gasoline Ram 3500. The 6.7L Cummins High Output turbo diesel does not use a traditional EVAP system.
The 2024 Ram 3500 EVAP System
- NVLD Module — Stellantis' Natural Vacuum Leak Detection system for passive leak testing
- Purge Solenoid Valve — Controls fuel vapor routing from charcoal canister to the 6.4L HEMI intake
- Vent Valve — Frame-mounted, seals the system during diagnostic tests
- Charcoal Canister — Frame-mounted vapor storage on the heavy-duty chassis
- Fuel Filler System — Cap or capless depending on trim
Most Likely Causes on a New Ram 3500
- Fuel Filler Issue (35% of cases) — Debris in the capless filler or improperly seated gas cap. Work truck environments increase filler contamination risk. Cost: $0 to clean.
- Factory Assembly Variation (25%) — An EVAP hose or connector not fully secured during heavy-duty assembly. The 3500's longer frame means more connections. Cost: $0 under warranty.
- NVLD Module Defect (15%) — Factory defect in the leak detection module. Cost: $0 under warranty.
- Purge Valve Defect (10%) — Intermittent solenoid fault from the factory. Cost: $0 under warranty.
- Software Calibration (10%) — PCM EVAP monitoring may need a software update. Cost: $0 under warranty.
- Vent Valve Issue (5%) — Vent valve not sealing properly from the factory. Cost: $0 under warranty.
Warranty Coverage
Your 2024 Ram 3500 is fully covered:
- Basic Limited Warranty: 3 years/36,000 miles
- Powertrain Warranty: 5 years/60,000 miles
- Federal Emissions Warranty: Additional emissions component coverage
Before the dealer: Inspect the fuel filler for debris or contamination. Clean if needed and drive for 2–3 cycles to see if the code clears.
The Verdict
The P0440 on your 2024 Ram 3500 is a warranty repair. Check the fuel filler first, then let your Ram dealer handle the rest using wiTECH diagnostics at no cost. Don't attempt DIY repairs on a truck with full factory coverage.