This bill directs the EPA to allow diesel vehicle manufacturers to disable engine power reduction and shutdown functions that are triggered by emissions control system failures when temperatures drop to zero degrees Celsius or below. The bill also permits manufacturers to exempt diesel vehicles that operate primarily in far northern regions (above 59 degrees north latitude) or in areas with prolonged freezing conditions from diesel exhaust fluid system requirements entirely. Congress argues these changes are necessary because emissions control systems often fail in extreme cold, creating safety risks for people in remote areas who depend on reliable transportation for emergency services and critical operations. The EPA must issue revised regulations within 180 days of the bill's enactment. The bill emphasizes that these cold-weather exemptions do not waive overall emissions standards under the Clean Air Act — they only apply when temperatures are extremely low or for vehicles in high-latitude regions where diesel exhaust fluid systems are impractical to maintain year-round.
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