This is a Genuine OEM GM 4-Pin Trailer Hitch Wiring Harness (GM internal name: HARNESS ASM-TRLR WRG INSTALL) for the 2020–2025 Buick Encore GX and 2021–2025 Chevrolet Trailblazer. It provides a 4-way flat connector for trailer lighting including running lights, turn signals, and brake lights, and installs at the rear of the vehicle.
Genuine GM OEM accessory providing a direct, plug-and-play fit with no splicing or cutting of vehicle wiring required. Fits 1.2L and 1.3L turbocharged 3-cylinder engines across both models. This harness requires the vehicle to have been equipped with factory trailering provisions — on Encore GX models this means Factory Option Code V92 must be present, and on Trailblazer models an Active Towplug connector must already be installed; vehicles without these factory trailering provisions are not compatible.
| Year Range | Make | Model | Trim/Engine | Notes/Options |
|---|---|---|---|---|
| 2020–2025 | Buick | Encore GX | 1.2L I3 Turbo, 1.3L I3 Turbo | Requires Factory Option Code V92 (Trailering Provisions) |
| 2021–2025 | Chevrolet | Trailblazer | 1.2L I3 Turbo, 1.3L I3 Turbo | Requires Active Towplug / factory trailering provisions |
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