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Graphic asking whether the EPA will eliminate DEF-related engine deratements, featuring a DEF fuel sign, a federal government building, and bold headline text highlighting potential changes to diesel emissions regulations.

News•News/Media Release•July 13, 2026

EPA Proposing Plan to Save Truckers $12 Billion by Revising Biden-Era Rule & Eliminating DEF Deratements

A U.S. Environmental Protection Agency proposal seeks to revise emissions compliance requirements enacted under the previous administration and eliminate DEF-related deratements completely. The public comment period is open now.

Paccar engine displayed alongside Kenworth and Peterbilt logos and a DEF pump sign, illustrating a software update addressing diesel exhaust fluid (DEF) inducement strategies for select heavy-duty trucks.

News•News/Media Release•July 8, 2026

Paccar Updates MX-11 and MX-13 Engine Software to Enhance Customer Operations

Kenworth Truck Company and Peterbilt Motors Company will update software for vehicles equipped with Paccar MX-11 and Paccar MX-13 engines to ensure they comply with EPA guidance on diesel exhaust fluid inducements.

News•News/Media Release•June 19, 2026

DTNA to Equip Vehicles with Updated DEF Inducement Software

Daimler Truck North America is equipping its Detroit engines with updated software reflecting the U.S. Environmental Protection Agency’s (EPA) revised guidance on diesel exhaust fluid (DEF) inducements.

News•Wayne Parham•January 16, 2025

CARB Withdraws EPA Waiver Request for Advance Clean Fleets Rule

The California Air Resources Board has withdrawn its waiver request with the Environmental Protection Agency related to California’s Advanced Clean Fleets rule, meaning an end to the proposed state regulation that would have mandated fleets over time convert to zero-emission vehicles.

A lab scientist holds up a glass container of a liquid substance during an expirement.

News•News/Media Release•May 31, 2024

Engine Technology Forum Wants the EPA to Revise Renewable Fuel Standards

In a letter from its executive director, the Engine Technology Forum called on the EPA to revise its renewable fuel volume determinations.

News•Staff•March 20, 2024

Strongest-Ever Pollution Standards for Light- and Medium-Duty Trucks Finalized

The U.S. Environmental Protection Agency announced final national pollution standards for passenger cars, light-duty trucks, and medium-duty vehicles for model years 2027 through 2032 and beyond.

News•Staff and News Reports•April 13, 2023

Industry Groups React to EPA's Proposed Emissions Standards

The U.S. Environmental Protection Agency released its proposed federal vehicle emissions standards, and industry groups from the automotive manufacturing, trucking, and environmental sectors issued varying statements to support, criticize, and critique the proposal.

News•Lauren Fletcher•April 12, 2023

How Biden’s Proposed Pollution Standards Will Impact Light- & Medium-Duty Trucks

The U.S. Environmental Protection Agency (EPA) announced new proposed federal vehicle emissions standards including passenger cars, light- and medium-duty vehicles, as well as heavy-duty trucks.

News•Staff and News Reports•March 23, 2023

EPA Waiver Will Allow California to Accelerate Diesel Truck Ban

The California rule includes stricter emissions requirements than the pending federal government’s regulation as well as a shorter timeline to implementation.

News•Staff•November 16, 2022

TRALA Files Amicus Brief in Texas v. EPA Case

TRALA asks the U.S. Court of Appeals for the District of Columbia Circuit Court to rule in favor of the State of Texas and other petitioners.

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