Replacing the original equipment diesel exhaust fluid (DEF) pump on certain Ram pickup trucks equipped with diesel engines is an expensive proposition. When the factory pump leaks, fails to circulate DEF and causes a check engine light, installing a high quality unit in its place is critical to the proper operation of the truck's selective catalytic reduction (SCR) system. A fully functioning pump is also a necessity to meet emissions standards. This DEF pump is designed to match the performance of the costly original unit and is engineered, manufactured and tested to strict standards for reliable performance and long service life. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Ram 2500: 2013, 2014, 2015, 2016, 2017, 2018] - [Ram 3500: 2013, 2014, 2015, 2016, 2017, 2018]