HR6250-119

What This Bill Does

The Cold Weather Diesel Reliability Act responds to findings that diesel vehicles and equipment are essential for rural cold-weather transportation and emergency services, while diesel exhaust fluid storage and emissions-control shutdowns can be unreliable or dangerous in prolonged freezing conditions. It directs EPA, within 180 days, to revise Clean Air Act regulations so covered manufacturers may suspend inducement-related engine derate or shutdown functions triggered by emissions-control faults when temperatures are at or below zero degrees Celsius and continued performance is necessary to prevent occupational danger, equipment failure, or loss of essential transportation in remote areas. EPA must also grant year-round exemptions from diesel exhaust fluid system requirements for covered vehicles operated north of 59 degrees north latitude or under prolonged freezing conditions that make DEF impractical. Only covered manufacturers may suspend the functions, engines must return to normal emissions operation above freezing, and the bill does not waive other emissions standards outside the specified cold-weather mode and DEF exemption.

Who Benefits and How

Cold-region diesel vehicle operators, emergency service fleets, rural transportation providers, and remote equipment users benefit from fewer engine derates or shutdowns when freezing conditions make diesel exhaust fluid systems unreliable. Covered diesel manufacturers benefit from clear authority to design or authorize cold-weather operational modes. Workers in remote areas benefit if essential mobility and equipment performance continue during extreme cold.

Who Bears the Burden and How

EPA must revise Clean Air Act regulations within 180 days and police the boundary between authorized cold-weather relief and ordinary emissions compliance. Environmental and public-health interests may bear increased emissions risk during exempted operations. Diesel manufacturers must manage compliance documentation and ensure systems return to normal emissions controls above freezing.

Key Provisions

• Requires EPA to revise regulations within 180 days to allow manufacturer-controlled suspension of engine derate or shutdown functions at or below zero degrees Celsius.
• Authorizes year-round diesel exhaust fluid system exemptions for covered vehicles operated north of 59 degrees north latitude or in prolonged freezing conditions.
• Requires engines to return to normal emissions-control operation when temperatures rise above zero degrees Celsius.
• Limits suspension authority to covered manufacturers rather than vehicle owners or other parties.
• Preserves Clean Air Act emissions standards outside the temporary cold-weather mode and DEF-system exemption.