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Truckmakers Challenge California’s Heavy-Duty Emissions Rules in Federal Court

Trump’s repeal of EPA waivers combined with DOJ cease-and-desist letters is leaving manufacturers unable to plan production under contradictory rules.

Major trucking companies are asking a federal judge to decide whether they must comply with the state’s clean-air standards that Republicans have acted to repeal.
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Overview

  • Four major truckmakers—Daimler Truck North America, Volvo Group North America, Paccar and International Motors—filed suit in the U.S. District Court for the Eastern District of California against the California Air Resources Board and Gov. Gavin Newsom.
  • The complaint argues President Trump’s June use of the Congressional Review Act voided EPA waivers that underpin California’s heavy-duty emissions standards, thereby preempting state enforcement.
  • U.S. Department of Justice letters instructing manufacturers to stop complying with California’s mandates have heightened regulatory conflict and prompted claims of irreparable harm to production planning.
  • The lawsuit criticizes the 2023 Clean Truck Partnership as unenforceable under federal repeal, drawing accusations from environmental advocates that the manufacturers have acted in bad faith.
  • Court decisions will determine whether California can enforce its zero-emission truck targets and set a precedent for state versus federal regulatory control.