Cold Weather Diesel Reliability Act of 2025

This bill would require the Environmental Protection Agency (EPA) to change its Clean Air Act rules within 180 days so that makers of diesel vehicles, diesel equipment, and their engines may turn off engine power reductions or shutdowns caused by emissions system faults when the outside temperature is at or below zero degrees Celsius. Only the manufacturer could turn off these functions, and the engine would have to return to normal emissions control once temperatures rise above freezing. The bill would also require the EPA to give a year-round exemption from diesel exhaust fluid system requirements to diesel vehicles mainly operated north of 59 degrees north latitude, or that face long periods of temperatures below the freezing point of diesel exhaust fluid. Other Clean Air Act emissions standards would still apply.

Full text and official record on Congress.gov

Sponsors

• Nicholas J. Begich III Republican sponsor
• 1 cosponsors