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EPA Tells Truck Makers to Stop Forcing Immediate Limp Mode for Low DEF
Trucks will no longer suddenly lose power when DEF levels get low.
In his announcement at the Iowa State Fair, a key event humming with agricultural workers who have long voiced their negative opinions of modern diesel emissions systems, Zeldin called the software-imposed restrictions “unacceptable” and “unnecessary.” It is unacceptable that farmers, truckers, construction workers, and many other small businesses continually experience failures of diesel-powered equipment when they need it most—costing millions of dollars in lost productivity,” Zeldin insisted. ET on August 12, 2025: This story now includes more details about the EPA’s plan to eliminate sudden power loss, instead making the engine derating process more gradual for drivers and equipment operators alike.
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