P0442 on Your 2024 Ram 2500
A P0442 code on your 2024 Ram 2500 points to a small evaporative emission system leak. On a brand-new heavy-duty truck, this is typically a minor issue — and your warranty should cover the diagnosis and repair at no cost.
Engine and EVAP System Notes
The 2024 Ram 2500 offers the 6.4L HEMI V8 and the 6.7L Cummins turbodiesel. P0442 is a gasoline EVAP code that applies to the 6.4L HEMI engine. The HEMI-equipped 2500 uses the ESIM (Evaporative System Integrity Monitor) to detect EVAP leaks, along with a purge solenoid and charcoal canister. The 2500's larger fuel tank capacity means more vapor volume and longer hose runs compared to the 1500.
Likely Causes on a New 2500
- Gas cap not fully seated (45%) — The most common trigger. HD trucks are often fueled in work environments where haste may lead to an incompletely sealed cap.
- Gas cap gasket contamination (20%) — Dust, dirt, and debris from construction sites or work environments can prevent a proper seal.
- Factory EVAP connection issue (15%) — A vapor line fitting that wasn't fully seated during assembly can manifest as a P0442 after initial road vibration.
- ESIM manufacturing defect (10%) — While rare, a new ESIM can have an internal defect from the factory.
- Purge solenoid factory defect (10%) — A minor seal imperfection in a new purge solenoid.
Recommended Action
Check and reseat your gas cap first — clean the gasket and filler neck, then twist until you hear firm clicks. If the code returns after a couple of drive cycles, schedule a warranty appointment at your Ram dealer. The dealer's wiTECH diagnostic system can quickly isolate the leak source. Do not pay out of pocket for any P0442 repairs on a 2024 model.
Cost Estimates (Reference Only)
- Gas cap replacement: $15–$40 ($0 under warranty)
- EVAP line repair: $120–$300 ($0 under warranty)
- ESIM replacement: $160–$380 ($0 under warranty)
- Purge solenoid replacement: $130–$290 ($0 under warranty)
Warranty Coverage
Your 2024 Ram 2500 is fully covered under the 3-year/36,000-mile basic warranty, 5-year/60,000-mile powertrain warranty, and federal 8-year/80,000-mile emissions warranty. All EVAP components are covered. Bring your truck to a Ram dealer for a no-cost warranty repair.