US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 1037 — CONTROL OF EMISSIONS FROM NEW HEAVY-DUTY MOTOR VEHICLESSubpart F — Test and Modeling Procedures1037.55040 C.F.R. § 1037.550Powertrain testing.Last amended: 2026Year: 2026Length: 9 wordsOfficial source Cite as 40 C.F.R. § 1037.550 (2026)See 40 CFR 1036.545 for the powertrain test procedure.Cross-references to the CFR40:1036.545Previous40 C.F.R. § 1037.540Next40 C.F.R. § 1037.551