US EditionDiesel engine operators can exhale with EPA's new DEF guidance
EPA's new guidance extends refueling time after Diesel Exhaust Fluid sensor alerts, preventing sudden engine slowdowns and saving family farms an estimated $727 million annually.
- On August 12, 2025, EPA Administrator Lee Zeldin announced new DEF guidance in Des Moines, Iowa, with U.S. Small Business Administrator Kelly Loeffler to protect diesel operators from engine derates.
- Under current EPA regulations, SCR sensor failures force engines to slow to 5 mph within four hours, causing frustration and operational delays for farmers, truckers, and equipment operators.
- The U.S. Environmental Protection Agency specified operators will have a warning light active for 650 miles or 10 hours after a sensor fault with no immediate performance loss.
- Family farms will save an estimated $727 million annually, and OOIDA and the 150,000 small-business truckers applauded the EPA’s action, SBA said.
- Few operators, particularly the nation’s 1.9 million family farms, will miss the guidance’s broader benefits, as SCR systems reduce 99% of nitrous oxide emissions, EPA said.
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EPA administrator announces power-loss ‘fix’ for diesel exhaust fluid systems
U.S. Environmental Protection Agency Administrator Lee Zeldin announced guidance Tuesday for engine and equipment manufacturers to prevent sudden shutdowns and power losses that occur in diesel exhaust fluid, or DEF, systems.
·Cedar Rapids, United States
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EPA responds to truckers’ DEF concerns with new guidance
The Trump administration has given truck drivers another gift. This time, it is addressing concerns about diesel exhaust fluid (DEF). Rules for DEF, selective catalytic reduction (SCR) systems and vehicle speeds will start for model year 2027 trucks. Yet, manufacturers have been derating engines since DEF became mandatory in 2010. Truck drivers, farmers and ranchers have complained about sudden speed reductions for years. Now, the federal govern…
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Leaning Left1Leaning Right0Center7Last UpdatedBias Distribution88% Center
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88% Center
13%
C 88%
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