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S 3135119th CongressIn Committee
Cold Weather Diesel Reliability Act of 2025
Introduced: Nov 6, 2025
Sponsor: Sen. Sullivan, Dan [R-AK] (R-Alaska)
Standard Summary
Comprehensive overview in 1-2 paragraphs
A Senate bill to require EPA to allow diesel vehicle manufacturers to suspend emissions-related engine derate or shutdown functions in prolonged cold weather conditions.
Key Points
- 1Authorizes suspension of emissions controls in extreme cold
- 2Applies to temperatures at or below 0°C
- 3Provides year-round DEF exemptions for vehicles north of 59°N latitude
- 4Requires return to normal emissions operation above freezing
- 5Addresses diesel exhaust fluid system reliability issues
- 6Maintains other Clean Air Act compliance requirements
Impact Areas
Diesel vehicle emissionsCold weather transportationEnvironmental Protection AgencyVehicle manufacturersRural and emergency services
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