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Truck Parts Costs Jump 20-30% as Tariff Uncertainty Ripples Through Supply Chain

President Trump's October 2025 proclamation imposed 25% tariffs on imported medium and heavy-duty vehicles and parts under Section 232 of the Trade Expansion Act. Replacement components for Class 3 through Class 8 trucks have spiked significantly as a result. Injectors, turbochargers, EGR systems, DPF assemblies and transmissions now cost 20% to 30% more than pre-tariff levels, according to Decisiv/TMC Parts and Labor Service Benchmark Report data. The increases extend beyond direct tariff impacts. Supply chain anxiety is driving preemptive price increases from distributors and manufacturers ahead of any physical shortage. The Richmond Federal Reserve's CFO Survey attributes nearly 40% of total unit cost growth in 2025-2026 to tariffs and tariff-related uncertainty. Steel and aluminum duties now reach 50%, pushing input costs through manufacturing chains. Brake components, frames and structural hardware face exposure despite not being directly tariffed.