CFR›Title 40›Chapter I›Part 1037›Subpart F›40 CFR 1037.550 Citation40 CFR 1037.550CorpusDaily eCFRDisplayed edition2026-09-15Last updated2026-09-15 § 1037.550 Powertrain testing.See 40 CFR 1036.545 for the powertrain test procedure. Previous 1037.540 § 1037.540 Special procedures for testing vehicles with hybrid power take-off. Next 1037.551 § 1037.551 Engine-based simulation of powertrain testing.