# 119-hr-6250: Cold Weather Diesel Reliability Act of 2025

119-hr-6250, Cold Weather Diesel Reliability Act of 2025, is a 119th Congress bill sponsored by Rep. Begich, Nicholas J. [R-AK-At Large] (R-AK); status introduced (as of 2026-09-21).

- Canonical: https://policyrisk.com/legislation/119-hr-6250
- As of: 2026-09-21
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: 119-hr-6250
- Congress: 119
- Title: Cold Weather Diesel Reliability Act of 2025
- Status: introduced
- Introduced: 2025-11-21
- Sponsor: Rep. Begich, Nicholas J. [R-AK-At Large] (R-AK)
- Cosponsors: 1
- Policy area: Environmental Protection
- Touches household money: no
- Last recorded action: 2026-09-21

## Summary

**Allow diesel engines to keep running in extreme cold by suspending emissions-triggered derates and exempting diesel exhaust fluid rules in high-latitude or freezing operations.** - Drivers and operators in very cold regions would be able to avoid engine derates or shutdowns at or below 0 degrees Celsius, helping prevent strandings and loss of essential transport in remote areas. - Covered manufacturers would be allowed to disable inducement-related derate or shutdown functions in those cold conditions and to omit derate triggers tied to diesel exhaust fluid systems for qualifying vehicles. - Remote worksites, emergency responders, and communities north of 59 degrees north latitude would get year-round relief from DEF requirements when documentation shows primary operation there or when prolonged freezing makes DEF use impractical. - The Environmental Protection Agency would be required to revise Clean Air Act regulations within 180 days to create these narrow cold-weather allowances while keeping standard emissions rules in place outside the authorized modes.

## Cosponsors (1)

- Rep. Maloy, Celeste [R-UT-2] (R-UT), 2026-04-21T00:00:00.000Z

## Provisions PRIA read

- Clean air rules mostly unchanged: benefit, medium. This bill would keep Clean Air Act emission rules in place. Only two narrow exceptions would apply: a cold‑weather mode at or below 0°C and a DEF exemption for certain northern or long‑freezing operations. It would define who is covered: EPA as the Administrator, covered manufacturers, and covered…
- Cold-weather relief for diesel engines: mixed, low. Within 180 days, EPA would need to change rules so makers can suspend engine derates or shutdowns at or below 0°C when emission faults trigger them. Engines would go back to normal controls when it is above 0°C. At 0°C or below, full power could continue if needed to prevent danger, equipment failu…

## Related bills

- 119-hr-4669: FEMA Act of 2025
- 119-hr-471: Fix Our Forests Act
- 119-hr-5351: NSF AI Education Act of 2025
- 119-hr-1897: ESA Amendments Act of 2025
- 119-hr-3633: Digital Asset Market Clarity Act
- 119-hr-21: Born-Alive Abortion Survivors Protection Act

## Sources
- [119-hr-6250 on Congress.gov](https://www.congress.gov/bill/119th-congress/house-bill/6250)

## Related
- [119-hr-4669: FEMA Act of 2025](https://policyrisk.com/legislation/119-hr-4669)
- [119-hr-471: Fix Our Forests Act](https://policyrisk.com/legislation/119-hr-471)
- [119-hr-5351: NSF AI Education Act of 2025](https://policyrisk.com/legislation/119-hr-5351)
- [119-hr-1897: ESA Amendments Act of 2025](https://policyrisk.com/legislation/119-hr-1897)
- [119-hr-3633: Digital Asset Market Clarity Act](https://policyrisk.com/legislation/119-hr-3633)
- [119-hr-21: Born-Alive Abortion Survivors Protection Act](https://policyrisk.com/legislation/119-hr-21)
- [All bills in Congress](https://policyrisk.com/legislation)

Source: PRIA, https://policyrisk.com/legislation/119-hr-6250 (as of 2026-09-21).