WTO notification · TBT
United StatesProposed measure, not in force yet
Official title
Amendments and Nonconformance Penalties for Model Year 2027 and Later Heavy-Duty Highway Engines and Amendments to Inducement Provisions for SCR-Equipped Diesel Engines
The United States notified this proposed TBT measure to the WTO on 15 July 2026. The comment period closed on 29 August 2026.
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Source: WTO ePing (opens in a new tab). Summaries by Expodite, which is independent of the WTO.
Published here:
Heavy-duty highway engines and vehicles; Quality; Transport exhaust emissions; Test conditions and procedures in general; Commercial vehicles
The comment period closed on 29 August 2026. You can still raise concerns about the measure with your country's WTO TBT enquiry point, quoting the document symbol G/TBT/N/USA/2301; it can take them up with the United States.
Find your country's enquiry point on WTO ePing (opens in a new tab)Proposed rule - The U.S. Environmental Protection Agency (EPA) is proposing regulatory amendments to certain compliance provisions and test procedures related to model year (MY) 2027 and later heavy-duty highway engines. These amendments would include changes to the regulatory useful life periods and the emission-related warranty periods. The EPA also proposes to add clarity to certain regulatory compliance provisions and correct errors in the regulations to support the MYs 2027 and later program for heavy-duty highway engines and vehicles. This includes certain amendments related to provisions adopted in January 2023 as well as other provisions adopted in earlier rules. The EPA also proposes to make nonconformance penalties (NCPs) available to manufacturers of medium heavy-duty engines (Medium HDE) and heavy heavy-duty engines (Heavy HDE) beginning in MY 2027. In addition, the EPA proposes to amend the requirements for selective catalytic reduction (SCR) system inducement provisions for newly manufactured diesel-fueled highway engines and vehicles (i.e., light- and medium-duty vehicles and heavy-duty engines) and nonroad engines and equipment. The EPA is also considering new inducement guidance for in-use highway and nonroad diesel engines, vehicles, and equipment. The EPA will hold virtual public hearings on 29 July 2026, starting at 9:00 a.m. Eastern Time and on 30 July 2026, starting at 10:00 a.m. Eastern Time. If there is sufficient interest, an additional day of…
Expodite writes its summary from the official record. The notification and the documents it notifies are on the WTO's own websites.
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