The Cummins ISB 5.9L Diesel Engine Computer ECM ECU PCM 24 Valve P3944105-RX is an Engine Control Unit (ECU) designed for easy installation on the front of a vehicle. This core unit requires programming and has a pin terminal type, with a female connector type for seamless integration. Manufactured by Cummins in the United States, this OEM part is a reliable replacement for ISB engines, offering a surface finish designed for optimal performance. With a length of 12 inches, this ECU is a crucial component for maintaining the functionality of your vehicle’s engine.