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A California program that aimed to remotely measure the emissions output of out-of-state heavy-duty vehicles traveling on state roads has been officially halted by the Environmental Protection Agency.

Daimler Truck North America, Paccar, Volvo Group North America and International Motors argued that the CTP violates the Clean Air Act and the Supremacy Clause of the U.S. Constitution.

State Attorney General Rob Bonta argued that Daimler Truck North America, International Motors, Paccar and Volvo Group North America are violating the terms of a contract signed in 2023 with CARB.

This time EPA is targeting the California Air Resources Board’s Clean Truck Check law, also known as the Heavy-Duty Inspection and Maintenance Program.

The California Air Resources Board and five other agencies recommended the state backfill the $7,500 federal tax credit for electric vehicles that is set to expire in late September.

The Department of Justice is seeking to intervene as a vested stakeholder in a case representing both the U.S. and EPA as plaintiffs against Steven Cliff in his capacity as CARB executive officer.

Daimler, International, Paccar and Volvo Group are suing the California Air Resources Board on grounds that federal actions vacated the state’s efforts to enforce its own emissions rules.

The pending expiration of federal rebates sets the stage for a nationwide rush of EV buying before the $7,500 federal credit expires.

The relationship between America’s truck makers and the California Air Resources Board forged in the Clean Truck Partnership is beginning to fray.

Days after the engine's first showcase at ATA's TMC 2025 annual meeting, the Trump administration warned EPA regulations for heavy-duty trucks would be reassessed, with rollback likely.