Classification hinges on whether the combustion engine can mechanically propel the vehicle or only generates electricity for the battery. If the engine drives only a generator and has no mechanical connection to the drivetrain, CBP may still classify the vehicle under 870460 as electrically propelled. However, if the engine can directly drive the wheels, a hybrid heading applies. This is a genuine classification gray area; importers should obtain a detailed powertrain schematic from the manufacturer and consider requesting a binding ruling from CBP before the first shipment.

South Korea's appearance in the supplier list reflects investment by Korean commercial vehicle and EV manufacturers in battery-electric truck platforms for export. South Korea is a US free-trade-agreement partner under KORUS, which may affect duty treatment for qualifying vehicles — importers should verify whether specific units meet KORUS rules of origin before claiming preferential treatment.