Federal Register #2026-14112

EPA Proposed Rule: Amendments and Nonconformance Penalties for Model Year 2027+ Heavy-Duty Engines

This opportunity involves a proposed regulatory amendment by the U.S. Environmental Protection Agency (EPA) impacting heavy-duty highway engine manufacturers for model year 2027 and beyond. - Government Buyer: - U.S. Environmental Protection Agency (EPA) - OEMs and Vendors: - No specific OEMs or vendors are named in this notice - Products/Services Requested: - No products, part numbers, or purchase quantities are requested, as this is a regulatory action - Notable Requirements: - Amendments to compliance provisions and test procedures for heavy-duty highway engines - Changes to regulatory useful life and emission-related warranty periods - Establishment of nonconformance penalties (NCPs) for medium and heavy heavy-duty engine manufacturers - Revisions to inducement provisions for selective catalytic reduction (SCR) systems to improve reliability and address diesel exhaust fluid (DEF) quality and tampering - Affects manufacturers and entities in engine equipment, automobile, truck manufacturing, and component supply sectors - Compliance with revised warranty, useful life, and SCR inducement provisions is required

Description

The U.S. Environmental Protection Agency (EPA) is proposing regulatory amendments to compliance provisions and test procedures for model year 2027 and later heavy-duty highway engines. The amendments include changes to regulatory useful life periods, emission-related warranty periods, and nonconformance penalties for medium and heavy heavy-duty engines. The EPA also proposes revisions to inducement provisions for selective catalytic reduction (SCR) systems to improve reliability and address concerns about diesel exhaust fluid (DEF) quality and tampering. Comments on the proposed rule must be received by August 29, 2026.

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