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S3135119th CongressWALLET

Cold Weather Diesel Reliability Act of 2026

Sponsored By: Senator Sullivan, Dan [R-AK]

In Committee

Summary

This bill would let certain diesel manufacturers temporarily suspend emissions-triggered engine derate or shutdown when ambient temperatures are at or below 20°F. It also creates a separate pathway to allow permanent suspension for agricultural equipment and for vehicles primarily operated north of 59° N latitude, subject to documentation of commercial operation.

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  • Covered manufacturers would be authorized to suspend inducement-related engine derate or shutdown functions when ambient temperatures are 20°F or colder. Engines must return to normal emissions-control operation once temperatures rise above 20°F and EPA must write the rule within 180 days.
  • Farmers and operators of agricultural equipment could seek a permanent suspension pathway if they document commercial operation and provide dispatch records, with EPA directed to establish that pathway within 180 days.
  • Operators of vehicles primarily run north of 59° N latitude can qualify for the same permanent relief after demonstrating their operational profile and meeting documentation requirements.
  • The Environmental Protection Agency would revise Clean Air Act regulations to implement these limited suspensions while the bill says it does not waive other emissions standards except as explicitly provided.

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Bill Overview

Analyzed Economic Effects

1 provisions identified: 1 benefits, 0 costs, 0 mixed.

Fewer diesel shutdowns in cold

This bill would let certain diesel manufacturers suspend engine derates or shutdowns caused by emissions-system faults when the outside temperature is 20°F or below. The EPA would have 180 days after enactment to update rules to allow this. The agency would also have 180 days to let manufacturers permanently suspend those shutdowns for defined farm equipment and for vehicles shown by records to operate mainly north of 59° north latitude. The bill would not waive any Clean Air Act emissions standards and would add definitions for agricultural equipment, covered manufacturers, and covered vehicles upon enactment.

Sponsors & CoSponsors

Sponsor

Sullivan, Dan [R-AK]

AK • R

Cosponsors

  • Sen. Lummis, Cynthia M. [R-WY]

    WY • R

    Sponsored 11/6/2025

  • Sen. Curtis, John R. [R-UT]

    UT • R

    Sponsored 2/26/2026

  • Sen. Murkowski, Lisa [R-AK]

    AK • R

    Sponsored 3/2/2026

Roll Call Votes

No roll call votes available for this bill.

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