Wiring harnesses for motor vehicles are generally classified under HTS Chapter 85 as sets of wiring for vehicles, rather than under Chapter 87 as vehicle parts. The specific subheading depends on the type of connectors and the vehicle application, and misclassification between these chapters is a common audit finding.

Many automotive electronic components — including sensors, control modules, and wiring assemblies — sourced from China are subject to Section 301 tariffs. The applicable list and rate depend on the specific HTS classification of the component, and importers should conduct a line-by-line review with a licensed customs broker to assess exposure.