S. 3135, the Cold Weather Diesel Reliability Act of 2025, advanced out of committee on September 16, 2026.
S. 3135 — Cold Weather Diesel Reliability Act of 2025
What it does
This bill directs the EPA to allow diesel vehicle manufacturers to disable engine power-reduction and shutdown systems triggered by emissions control failures when temperatures drop below freezing, and to exempt vehicles operating in extreme-cold regions from diesel exhaust fluid (DEF) system requirements year-round. The bill frames this as a safety measure for rural and remote areas where DEF supply is unreliable and engine shutdowns pose life-threatening risks.
Quorum's transparency scan gave Cold Weather Diesel Reliability Act of 2025 a high transparency warning.
What happens next
S. 3135 advanced out of committee. Next stop: a floor vote.
Who is behind it
Filed by Dan Sullivan. Cosponsored by Cynthia Lummis, John Curtis and Lisa Murkowski.
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