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SITCSection 7
U.S. imports of compression-ignition (diesel and semi-diesel) engines for road vehicles (SITC 71323) totaled $226.6M in April 2026, traded with 27 countries.
Importers of Compression-Ignition (Diesel and Semi-Diesel) Engines for Road Vehicles paid $16.8M in duties in April 2026 — an effective duty rate of 9.1% on $184.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Compression-Ignition (Diesel and Semi-Diesel) Engines for Road Vehicles imports of $226.6M in April 2026 ran 10% above the year-to-date monthly average of $205.3M.
Last updated: April 2026 dataDiesel and semi-diesel compression-ignition engines destined for road vehicles — including trucks, buses, and heavy equipment — are a foundational input for the commercial transportation sector. Unlike spark-ignition counterparts, these engines are classified by their ignition method and end-use application (road vehicles), making both technical specification and intended use relevant to correct tariff placement. Emissions certification documentation from the EPA or CARB is frequently required at entry for engines intended for on-road use in the United States.
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Yes. Diesel engines for on-road use must comply with EPA emissions standards under the Clean Air Act, and importers are required to file an EPA Declaration Form (3520-1) at entry. Engines that do not meet applicable standards may be refused admission or require modification before release. CARB standards apply additionally for engines destined for California use.
Classification hinges on the engine's design and intended application. Technical documentation such as the manufacturer's application guide, emissions certification (on-road vs. non-road), and any vehicle-specific mounting or control features are the primary evidence. An engine certified and marketed for on-road trucks falls here, while an otherwise similar engine designed for agricultural or marine use would be classified under a different SITC heading.
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Monthly import values over time