From 2003 Dodge RAM 2500 5.9L, Cummins ECM ECU Engine Computer Module Part# 3963994. This item fits many years, please compare pictures to ensure this is the correct part for your application. Item in the pictures is the exact item you will be receiving; some used items may be greasy or dirty. Electronics: Any electronics such as but not limited to ECM’s, gauge clusters, fuse boxes, TIPMS, radios, etc may require programming from a dealership. Truck Flow LLC does NOT offer any programming of any item(s) that we sell. Wiring faults such as shorts may damage working parts causing them to fail. PLEASE follow all diagnostic steps before purchasing electrical parts because they are NON-REFUNDABLE or RETURNABLE. Hospitals, Schools, Farms, Storage Units, Home Business, Airports, No Truck/ Limited Access zones and Military Bases are NOT accepted as valid commercially zoned address. All parts must be installed by a certified mechanic. Engine warranties are limited to manufacturing defect in the block, head(s), pistons, crankshaft, rockers and oil pump. Dismantling of any part(s) for ANY reason without prior permission from Truck Flow LLC. Installation and/or use of part in ANY type of racing NON-STOCK application.