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Diesel Engine Reliability in Extreme Cold: Preventing Shutdowns for Safety.

This law aims to boost safety and transportation reliability in extremely cold regions by addressing issues with diesel emissions control systems. It allows manufacturers to temporarily disable automatic engine power reduction or shutdown features triggered by emissions system faults when temperatures drop below freezing. This change prevents dangerous failures of critical equipment, such as emergency and transport vehicles, in life-threatening conditions.
Key points
Diesel trucks and emergency vehicles will not automatically lose power or shut down due to emissions system faults when temperatures are at or below 0°C (32°F).
Vehicles operating in the coldest regions (e.g., far north) can receive a year-round exemption from requirements related to the Diesel Exhaust Fluid (DEF) system, which often fails in freezing conditions.
The primary goal is to ensure critical transportation and emergency services remain operational and safe during prolonged cold weather.
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Previous:
Introduced
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Status:
Placed on Calendar
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Additional Information
A bill to require the Administrator of the Environmental Protection Agency to authorize manufacturers of certain vehicles to suspend engine derate or shutdown functions in prolonged cold weather conditions, and for other purposes.
Print number: S 3135
Sponsor: Sen. Sullivan, Dan [R-AK]
Process start date: 2025-11-06
System Note: Lustra is free, publicly auditable civic infrastructure, with full source code available on GitHub. You are reading sterilized legislative data, processed by our radical neutrality engine to strip political spin and retain factual mechanics. We process only official government data. Original documents remain the authoritative source, always verify them if you can.
Summarized by: gemini-2.5-flash-preview-09-2025
Source data: api.congress.gov
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Summary & Status

Key Questions about Diesel Engine Reliability in Extreme Cold: Preventing Shutdowns for Safety.

A structured overview of the legislative process, official sources, status and civic context.

What is the official ID of this bill?

The official print number for this legislation is S 3135.

Which chamber initiated this legislation?

This legislation was initiated in the Senate.

When did the legislative process begin?

The process officially started on 2025-11-06.

What are the main provisions?

Key points include:

  • Diesel trucks and emergency vehicles will not automatically lose power or shut down due to emissions system faults when temperatures are at or below 0°C (32°F).
  • Vehicles operating in the coldest regions (e.g., far north) can receive a year-round exemption from requirements related to the Diesel Exhaust Fluid (DEF) system, which often fails in freezing conditions.
  • The primary goal is to ensure critical transportation and emergency services remain operational and safe during prolonged cold weather.

What is the specific legal status?

The current status is Placed on Calendar.

Where can I read the full text of this legislation?

The full official text is available at: View full text

Who is the primary sponsor?

The primary sponsor is Sen. Sullivan, Dan [R-AK].

What is the latest detailed status?

The latest detailed status is: Placed on Senate Legislative Calendar under General Orders. Calendar No. 619.

Is this summary verified?

Yes. This content was analyzed by AI and verified by the Lustra Judge System on 2025-12-23.

Analysis and Potential Impact of S 3135

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CATEGORIES

Transport Environment Security