How Much More Are Truck Parts Costing After the November Tariff?

How much did truck parts go up after the November 2025 tariff?

The Section 232 tariff on imported medium and heavy-duty truck parts, Class 3 through Class 8, added 25% to the landed cost of engines, transmissions, tires, and chassis components starting November 1, 2025. The proclamation signed October 17, 2025 covers parts classified as knock-down kits with no exceptions. For USMCA-compliant parts from Mexico and Canada, the tariff applies only to the non-U.S. content portion of the component. The result at the parts counter: injectors, turbochargers, EGR systems, DPF assemblies, and transmissions are running 20% to 30% more expensive than the same part cost in October.

Fleets that skipped the new-truck price headlines because they weren't spec'ing units this year are now paying the tariff every time a high-mileage truck throws a code. The components that fail most often on aging trucks, the parts a shop orders weekly, are the ones hit hardest. A turbo replacement that ran $1,800 in September is now $2,160 to $2,340. An injector set that cost $2,400 is $2,880 to $3,120. The math compounds when a truck needs multiple parts in one visit.

Which parts are dutiable under Section 232?

The tariff covers engines, transmissions, tires, and chassis components imported into the U.S. Parts classified as knock-down kits or equivalent compilations are fully dutiable with no carve-outs. USMCA-compliant parts from Mexico and Canada face the 25% tariff only on the non-U.S. content share, a transmission assembled in Saltillo with 60% Mexican content pays the tariff on that 60%, not the full unit value. Parts with higher domestic content percentages see smaller effective tariff rates, but few aftertreatment components or electronic modules clear the threshold to avoid the duty entirely.

The stacking rules matter for shops ordering OEM parts versus aftermarket. An OEM replacement DPF assembly sourced from a Tier 1 supplier in Mexico may carry a lower effective tariff if the substrate and housing are U.S.-origin, but the sensors and wiring harness are typically imported sub-components that push the dutiable share higher. Aftermarket suppliers with Asian supply chains face the full 25% on most SKUs.

What does this mean for maintenance budgets?

A fleet running 50 trucks with an average age of six years can expect annual parts spend to climb $15,000 to $25,000 if replacement intervals hold steady. The increase hits hardest on emissions-related failures, DPF, DOC, SCR, EGR coolers, because those parts were already expensive and are almost entirely imported. A DPF assembly that cost $3,200 in October is now $3,840 to $4,160. An EGR cooler that was $1,100 is $1,320 to $1,430.

Shops are adjusting by stretching service intervals where the spec allows it, running used parts longer, and sourcing remanufactured components when warranty coverage permits. The reman market is seeing tighter supply as cores become more valuable, a turbo core that brought $200 in trade six months ago is now worth $260 to $300 because the replacement unit costs more to import new.

Are there workarounds for the tariff?

Buying in bulk before a known failure doesn't help unless the shop has cash flow and warehouse space to stock high-dollar parts. Most small fleets and owner-operators order parts as trucks break, which means paying the tariff every time. Switching to aftermarket parts with higher U.S. content can lower the effective tariff, but compatibility and warranty concerns limit that option on newer trucks still under OEM coverage.

Some fleets are extending trade cycles to avoid the new-truck tariff, but that strategy pushes more trucks into the high-failure-rate mileage band where parts costs are climbing fastest. A truck kept in service from 600,000 miles to 750,000 miles will need more injectors, more turbo work, more aftertreatment replacements: all now 20% to 30% more expensive. The TCO math that made running a truck to 800,000 miles pencil out in 2024 is tighter in 2026.

What this costs per truck per year

A Class 8 truck averaging 120,000 miles per year with typical maintenance will see parts costs rise $1,200 to $2,000 annually from the tariff alone, assuming no major failures. A truck that needs a turbo, an injector set, and a DPF replacement in the same year, not uncommon at 500,000 miles, will see an additional $2,500 to $3,500 in parts cost versus pre-tariff pricing. Shops that were already deferring non-critical repairs to manage cash flow now face harder decisions on what gets fixed and what gets band-aided until rates improve.