EPA's relaxed NOx rule, as many expected, removes the warranty extension—and proposes annihilating the troublesome DEF derate ...

Cummins and PACCAR are updating diesel engine software to give operators more time to address certain DEF-related issues ...

Updated diesel engine software gives truck operators more time to address emissions-system issues while staying compliant ...

These two major engine manufacturers are aligning with relaxed EPA guidance related to sudden derates due to DEF/emissions ...