The Engine Computer Control Module ECU Cummins ISB ECM 3990517 CM550 is a front-mounted ECM with female connectors and pin terminals, providing easy installation for Cummins ISB engines. With a maximum amperage of 12A and a compact design, this ECM is a crucial component for controlling engine operations and ensuring optimal performance in your vehicle. Remember to follow safety guidelines when working with diesel engines, especially in regards to ventilation and operation.