EPA Proposes Killing Diesel Derate on New Engines, Hearing July 29
EPA signed a proposed rule July 9 to stop new diesel engines from derating to 5 mph when emissions sensors fault. Virtual hearing runs July 29 and 30; written…
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EPA Lets Truck Makers Raise DEF Limp-Mode Speed to 25 MPH
PACCAR and Daimler are rolling out software updates that extend DEF fault timelines to 160 hours and raise final derate speed from 5 mph to 25 mph, following…
Trump Pardons 11 Diesel Tuners, Ending Federal Tampering Prosecutions
White House grants full clemency to mechanics convicted of selling or installing emissions defeat devices. DOJ has stopped all new criminal cases, but civil…
EPA Extends DEF Derate Grace Period to 650 Miles, 25 mph Floor
New EPA guidance gives fleets 650 miles of warning-only operation after a DEF fault, then 4,200 miles at 15% derate before speed drops to 25 mph. Software…
Engine Technology Forum Launches SCR, DEF Resource Center
New website consolidates technical fact sheets, webinars, and policy guidance on selective catalytic reduction and diesel exhaust fluid systems for fleets…
What the 2027 prebuy premium will cost fleets per truck
Fleet Advantage warns operators to budget for elevated pricing as OEMs phase in EPA 2027 NOx hardware ahead of the regulatory deadline.