Diamond T ECM for Dodge (2006) 5.9L Cummins with Manual Transmission

The Diamond T ECM for Dodge (2006) 5.9L Cummins with Manual Transmission (ECMDC0659M-CM849A) is built specifically for 2006 Ram 2500/3500 trucks equipped with the 5.9L Cummins and a G56 manual transmission using the CM849A engine controller. It is intended as a direct replacement for the factory ECM used in these manual-trans applications, helping restore proper starting, fueling, and overall driveability when the original computer has failed.

This unit targets the CM849A manual ECM family and is commonly used to replace controllers found under OE part numbers such as 4937148, 4931973 and 4931975. By matching the correct calibration and communication protocols for the 2006 5.9L Cummins platform, the Diamond T ECM is designed to work seamlessly with the truck’s existing wiring, sensors, dash cluster and drivetrain controls, making it a practical solution for repair shops, fleet maintenance and owners who need a plug-in replacement.

Each ECMDC0659M-CM849A unit is remanufactured and tested with the goal of delivering reliable performance in real-world use, rather than just clearing codes temporarily. It is backed by a 1-year warranty against defects in materials and workmanship when installed in the proper 2006 manual-trans application. As with every Diamond T electronic component, this ECM reflects our commitment to high-quality, American-branded products for serious diesel owners—American Made, Because It Matters.