The updated software gives Mack and Volvo truck owners more time to address DEF-related issues before the engine derates or the vehicle goes into reduced-speed inducement, following new EPA guidance.

Volvo Trucks and Mack Trucks on Monday announced updates to their diesel exhaust fluid (DEF) software to increase the minimum speed for DEF-related engine derates, in accordance with updated ...

HOLLY, Mich., April 16, 2025 (GLOBE NEWSWIRE) -- A diesel truck, car or SUV that is losing power and fuel economy, shutting down unexpectedly, and/or has a DEF warning light illuminated is probably ...

The Environmental Protection Agency is taking steps to address widespread concerns from farmers, truckers, and other diesel vehicle operators about a loss of speed and power, or engine derates, caused ...

WASHINGTON – On Tuesday, February 3, 2026, Administrator Lee Zeldin took another step to further the Trump EPA’s work to address widespread concerns from farmers, truckers, motor coach operators, and ...

The U.S. Environmental Protection Agency (EPA) is escalating its response to consumer complaints regarding Diesel Exhaust Fluid (DEF) system failures, announcing a new investigation aimed at major ...