Duramax Fifth Generation: 2011-2016 (LML)
I have a 2014 LML 2500HD. On July 5th towing our 5th wheel back from Hershey I got a poor quality DEF reading. Since that time I have spent $2500 on parts and labor. Finally I get a call saying I need a diesel particulate filter. I agreed to go ahead with the service and was told that the part...