Heading 870443 requires both a compression-ignition engine and an electric motor used for propulsion. If the electric motor provides only supplemental torque assist rather than independent propulsion capability, CBP may determine the vehicle belongs under the conventional diesel heading (870423) instead. The classification turns on whether the electric motor is genuinely capable of propelling the vehicle, not merely assisting it — a distinction that should be resolved with manufacturer documentation before entry.

Heavy trucks must comply with EPA emissions standards and NHTSA Federal Motor Vehicle Safety Standards regardless of propulsion type. Hybrid powertrains may require additional EPA certification documentation covering both the diesel engine and the electric drive system. Importers should confirm that the vehicle holds valid EPA and NHTSA certifications for the US market before shipment to avoid costly port holds or refusal of entry.