When working on Cummins engines that are Common-Rail injected (2003 MY and up), you may experience diagnostic trouble code P0251. The customer complaint is usually a loss of power when the truck is in a hard pull, especially when towing. I see this quite often at the shop. This code can be somewhat chronic if
Diesel technology has come a long way, evolving from smelly, dirty, slow, workhorse engines to clean-burning, high-torque, high-horsepower engines that can give many gasoline engines a run for the money on a drag strip or race track.