USA - Greenhouse Gas Emissions Standards for Heavy-Duty Vehicles - Phase 3

​The Environmental Protection Agency (EPA) is promulgating new greenhouse gas (GHG) emissions standards for model year (MY) 2032 and later heavy-duty highway vehicles that phase in starting as early MY 2027 for certain vehicle categories. The phase in revises certain MY 2027 GHG standards that were established previously under EPA's Greenhouse Gas Emissions and Fuel  Efficiency  Standards  for  Medium-and  Heavy-Duty Engines and Vehicles--Phase 2 rule  ("HD GHG Phase 2"). This document also updates discrete elements of the Averaging Banking and Trading program, including providing additional flexibilities for manufacturers to support the implementation of the Phase 3 program balanced by limiting the availability of certain advanced technology credits initially established under the HD GHG Phase 2 rule. EPA is also adding warranty requirements for batteries  and other components of zero-emission vehicles and  requiring  customer-facing  battery state-of-health monitors for plug-in hybrid and battery electric vehicles. In this action, we are also finalizing additional revisions,  including clarifying and editorial amendments to certain highway heavy-duty vehicle provisions and certain test procedures for heavy-duty engines.

Title 40 Code of Federal Regulations (CFR) Parts 86, 1036, 1037, 1039, 1054, and 1065.

This final rule is effective on June 21, 2024. The incorporation by reference of certain material listed in  this rule is approved by the Director of  the Federal  Register  beginning June 21, 2024. The incorporation by reference of certain other material listed in this rule was previously approved by the Director of the Federal Register as of March 27, 2023.

The final rule and the notice of proposed rulemaking notified as G/TBT/N/USA/1987 are identified by Docket Number EPA-HQ-OAR-2022-0985. The Docket Folder is available on Regulations.gov at https://www.regulations.gov/docket/EPA-HQ-OAR-2022-0985/document and  provides  access  to primary and supporting documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.​