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A notice from the U.S. Environmental Protection Agency to revisit parts of the Phase 2 final rule on greenhouse gas emissions from heavy- and medium-duty trucks isn’t likely to create changes quickly, as the agency has not presented plans for expedited action and environmental groups are vowing to pursue a challenge in a federal appeals court — once the case is no longer being held in abeyance.

MADRAS, Ore. — Fleet owners should not expect the truck and engine sections of the federal Phase 2 rule on greenhouse gas emissions to change before implementation starts in 2021, said Roger Nielsen, the CEO of Daimler Trucks North America.

The diesel engines built this year are more efficient as the second step of greenhouse-gas Phase 1 standards takes effect. These power plants also offer improved reliability, advanced engineering, reduced maintenance and performance improvements that fleet managers and truck drivers will notice, industry experts said.

Eight states and five environmental groups filed motions with a federal appellate court on Jan. 23, asking to intervene in a lawsuit brought by the Truck Trailer Manufacturers Association against two federal agencies over the Phase 2 greenhouse gas rule on truck emissions.