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Beginning with the 2021 model year, all new heavy-duty on-road motor vehicles will be required to comply with Phase 2 EPA's Greenhouse Gas (GHG) standards. This includes electric vehicles, vehicles fueled by conventional and alternative fuels, and trailers. For the purposes of this regulation, “heavy-duty” means a vehicle with gross vehicle weight rating (GVWR) above 8,500 pounds, a curb weight above 6,000 pounds, or a basic vehicle frontal area greater than 45 square feet.

Phase 2 GHG emissions certification for heavy-duty vehicles requires the use of a combination of certified components. At a minimum, vehicles are required to utilize engines that are certified to EPA's GHG standards (i.e., CO2, CH4, and N2O), low rolling-resistance tires, and air conditioning systems that meet specified leakage rates. And unlike light-duty vehicles, the heavy-duty vehicle market is not vertically integrated, which means manufacturers can utilize engines, air conditioning systems, and tires from several different manufacturers in the same vehicle model (provided all component combinations result in a vehicle that meets the applicable GHG standard).

Phase 1 GHG emissions certification has been required for non-exempt heavy-duty vehicles and trailers since the 2014 model year. Those standards are less stringent than Phase 2 standards and can generally be met with the use of low rolling-resistance tires. An EPA Certificate of Conformity (CoC) certifying compliance with this regulation is required for all subject vehicles registered or sold in the United States. The California Air Resources Board (CARB) has adopted similar Phase 1 and Phase 2 standards, which means both an EPA CoC and a CARB Executive Order (EO) are required for vehicles registered or sold in California.

For more information or compliance assistance, please contact Lori Williams of Trinity's Mobile Source and Fuels business line.