DEF News Updates

Each Volvo Group unit said its flagship on-highway tractors began rolling off production lines in May with the updates already in place.

EPA has proposed ending diesel exhaust fluid-related engine derates, replacing the gradual dialing back of truck performance with visual or audible notifications.

A longtime advocate in Washington for trucking stakeholders, Gelb replaced Jed Mandel, who ended a quarter of a century as EMA president in September 2025.

The EPA has approved a change regarding sensor requirements for diesel exhaust fluid systems in response to complaints from frustrated truck owners.

In early 2026, the primary parts-related issue for managers is cost containment, said Robert Braswell, TMC’s executive director.

ATA President Chris Spear outlined for TMC attendees the breakneck pace at which challenges are confronting the carriers that comprise ATA's membership base.

Nebraska is asking truckers and farmers to report problems with DEF systems in order to hold manufacturers accountable for service issues, while telling consumers they have a right to self-repair.

EPA Administrator Lee Zeldin is asking major diesel engine OEMs to provide critical data about diesel exhaust fluid system failures to remedy equipment problems for truckers and farmers.

“We have heard loud and clear from small businesses across the United States that the current DEF system is unacceptable," EPA Administrator Lee Zeldin said.

Software overrides for diesel exhaust fluid sensors that are in perilously short supply are making their way from truck manufacturers to repair shops, helping keep equipment on the road and prevent engine shutdowns that can leave a truck stranded when the sensors fail.