Data / Federal rules / 2026-14112
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 Environmental Protection Agency published this proposed rule in the Federal Register on July 14, 2026. Comments closed on August 29, 2026.
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What the agency says
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.
Key facts
- Document number
- 2026-14112
- Type
- Proposed rule
- Action
- Proposed rule
- Agency
- Environmental Protection Agency
- Published
- July 14, 2026
- Comments due
- August 29, 2026
- Dates
- Comments. Comments must be received on or before August 29, 2026. Comments on the information collection provisions submitted to the Office of Management and Budget (OMB) under the Paperwork Reduction Act (PRA) are best assured of consideration by OMB if OMB receives a copy of your comments on or before August 13, 2026.
- Docket
- EPA-HQ-OAR-2026-0728; FRL 12756-01-OAR
- Regulation ID (RIN)
- 2060-AW83
- Code of Federal Regulations
- 40 CFR 86; 40 CFR 1036; 40 CFR 1037; 40 CFR 1039; 40 CFR 1065; 40 CFR 1071
- Topics
- Administrative practice and procedure; Air pollution control; Confidential business information; Environmental protection; Greenhouse gases; Imports; Incorporation by reference; Labeling; Motor vehicle pollution; Penalties; Reporting and recordkeeping requirements; Research; Warranties
- Pages
- 144
Other documents from the Environmental Protection Agency
Everything from the Environmental Protection Agency · Rules on administrative practice and procedure · Rules on air pollution control · Rules on confidential business information · Published in July 2026
Read from the Federal Register API, last updated 2026-10-24. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.