Regulations last checked for updates: Oct 03, 2026

Title 40 - Protection of Environment last revised: Oct 01, 2026
All TitlesTitle 40Chapter IPart 1037Subpart C - Subpart C—Certifying Vehicle Families
View all text of Subpart C [§ 1037.201 - § 1037.255]
§ 1037.231 - Powertrain families.

See 40 CFR 1036.231 for provisions describing how to divide your product line into powertrain families.

[91 FR 7790, Feb. 18, 2026]
authority: 42 U.S.C. 7401—7671q
source: 81 FR 74048, Oct. 25, 2016, unless otherwise noted.
cite as: 40 CFR 1037.231
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