The federal district court for the Eastern District of California granted heavy-duty truck and engine manufacturers’ motion for a preliminary injunction enjoining the California Air Resources Board (CARB), the Executive Officer of CARB, and Governor Gavin Newsom from implementing, enforcing, attempting to enforce, or threatening to enforce the Clean Truck Partnership, a 2023 agreement in which CARB agreed to undertake certain regulatory actions sought by the manufacturers and the manufacturers agreed to meet certain state clean vehicle standards. The court found that the manufacturers showed that there were clear questions going to the merits of their claim that the Clean Air Act preempts the Clean Truck Partnership and that CARB’s filing of a breach of contract lawsuit on October 27 to enforce the agreement (discussed below in the “New Cases” section) was sufficient to establish concrete and nonspeculative irreparable harm. The court also found that the balance of equities tipped in the manufacturers’ favor. The court denied the preliminary injunction motion to the extent relief was sought on the basis of the manufacturers’ preemption claims for six sets of CARB regulations; a now-superseded May 2025 manufacturers advisory correspondence expressing CARB’s intent to continue enforcing its vehicle standards even if the President signed Congressional Review Act resolutions disapproving the preemption waivers for the standards; and an executive order issued by Governor Newsom in June 2025 that directed CARB to develop clean vehicle regulations. The court found that the manufacturers failed to establish irreparable harm for these claims. The court also found that the manufacturers’ First Amendment claim did not provide grounds for a preliminary injunction.

Heavy-duty truck and engine manufacturers' lawsuit seeking to enjoin California's enforcement of certain state vehicle emissions standards without a Clean Air Act preemption waiver from the U.S. Environmental Protection Agency.

Daimler Truck North America LLC v. California Air Resources Board

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Federal District Court Enjoined CARB from Enforcing Clean Truck Partnership Against Manufacturers

Filed

United States of America

California

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Federal District Court Enjoined CARB from Enforcing Clean Truck Partnership Against Manufacturers

Target

Policy instrument

Risk

Renewable energy

Greenhouse gas

Economic sector

Finance