C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER U—AIR POLLUTION CONTROLS › PART 1037—CONTROL OF EMISSIONS FROM NEW HEAVY-DUTY MOTOR VEHICLES › Subpart C—Certifying Vehicle Families

40 C.F.R. § 1037.231

Powertrain families

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

[91 FR 7790, Feb. 18, 2026]