Decoding the P0440 on Your 2024 Ram 2500
A P0440 code on your 2024 Ram 2500 heavy-duty truck means the Powertrain Control Module (PCM) has detected a malfunction in the evaporative emission control (EVAP) system. On a brand-new truck with full warranty coverage, this code should be resolved at your dealer — but understanding the system helps you know what to expect.
Note: This code applies to gasoline-powered Ram 2500 models with the 6.4L HEMI V8. The 6.7L Cummins turbo diesel does not use a traditional EVAP system.
The 2024 Ram 2500 EVAP System
- NVLD Module — Natural Vacuum Leak Detection system monitors fuel tank vacuum to detect EVAP leaks
- Purge Solenoid Valve — Controls fuel vapor flow from charcoal canister to the 6.4L HEMI's intake
- Vent Valve — Frame-mounted, controls atmospheric air entry and system sealing
- Charcoal Canister — Frame-mounted vapor storage
- Fuel Filler System — Cap or capless depending on trim level
Most Likely Causes on a New Ram 2500
- Fuel Filler Seal Issue (35% of cases) — Debris in the capless filler or an improperly seated gas cap. Cost: $0 to clean/reseat.
- Factory Assembly Variation (25%) — An EVAP hose connection not fully secured during HD truck assembly. Cost: $0 under warranty.
- NVLD Module Defect (15%) — Factory defect in the leak detection module. Cost: $0 under warranty.
- Purge Valve Defect (10%) — Intermittent electrical or mechanical fault from the factory. Cost: $0 under warranty.
- Software Calibration (10%) — PCM EVAP monitoring parameters may need a software update. Cost: $0 under warranty.
- Vent Valve Issue (5%) — Vent valve not sealing from the factory. Cost: $0 under warranty.
Warranty Coverage
Your 2024 Ram 2500 is fully covered:
- Basic Limited Warranty: 3 years/36,000 miles
- Powertrain Warranty: 5 years/60,000 miles
- Federal Emissions Warranty: Additional emissions coverage
Before the dealer: Inspect the fuel filler for debris. For capless fillers, check inside with a flashlight. For cap-equipped trims, verify the cap clicks firmly. If cleaning the filler resolves the light after 2–3 drive cycles, you're done.
The Verdict
The P0440 on your 2024 Ram 2500 is a warranty repair. Check the fuel filler first, then let your dealer use wiTECH diagnostics to identify and fix the exact cause at no cost to you.