#Diesel Emissions

2 posts tagged with this topic.

Compliance & FMCSA Jul 11, 2026

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…

By Marvin Aldridge

Compliance & FMCSA Jun 19, 2026

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…

By Marvin Aldridge