ELR Citation: 55 ELR 20151
No(s). 2:25-cv-02255-DC-AC (E.D. Cal. Oct 31, 2025) (Coggins, J.)

A district court granted in part and denied in part heavy-duty vehicle manufacturers' motion to preliminarily enjoin enforcement of California regulations requiring companies to meet state motor vehicle emission standards. The manufacturers argued a 2023 agreement between the state and the trucking industry violated the CAA and the Supremacy Clause, and sought to enjoin the state from enforcing it. The court found the manufacturers showed that there were serious arguments that the agreement was preempted, as the state's recent filing of a breach-of-contract suit against the manufacturers seeking specific performance was an attempt to enforce preempted standards at least in part, and that there was concrete, irreparable harm due to the state's attempted enforcement. The manufacturers also argued the CAA preempted six California regulations, correspondence issued by the state clarifying its intention to continue enforcing the regulations even if the president signed joint disapproval resolutions passed by Congress, and an executive order issued by the governor reaffirming California's commitment to accelerate the deployment of zero emission technologies; but the court found the manufacturers failed to show they would suffer irreparable harm as to those claims. It preliminarily enjoined California from enforcing the 2023 agreement, but denied the motion with respect to the other two claims.