GM GENUINE PARTS Trailer Brake Control Switch Assembly 84108373 Black OE-fit, Durable

GM Genuine Parts 84108373 is a factory-style trailer brake control switch assembly that replaces the original OEM unit to restore proper trailer braking signal and driver control.

This switch assembly is engineered and validated by General Motors to meet original equipment standards for fit, function, and durability. It activates the trailer's braking system when the vehicle brake pedal is depressed and helps regulate the electrical signal that determines how much braking force the trailer receives. As a recommended GM replacement, the 84108373 is intended for vehicles that require a like-for-like repair with GM OE performance.

How does this switch assembly affect trailer braking performance?

The brake control switch is the electrical interface between your vehicle’s brake pedal and the trailer brakes. When installed correctly, it ensures the trailer receives a consistent, proportional brake signal to engage its brakes in step with the tow vehicle.

• Replaces worn or failed factory switch to restore brake signal reliability.
• Helps maintain synchronized stopping between vehicle and trailer.
• Minimizes spurious or intermittent trailer braking faults.

Will this GM part fit my vehicle and match the original specifications?

GM Genuine Parts are manufactured to Original Equipment specifications, so the 84108373 is designed to match the original component’s fit, electrical connections, and mechanical operation for compatible GM models. Verify part number compatibility with your vehicle’s year, make, and model before purchasing.

• Engineered to GM OE dimensions and electrical requirements.
• Direct-replacement design for a straightforward install in matching vehicles.
• Backed by GM validation for parts that were used or approved for production vehicles.

What should I expect during installation and service life?

Installation typically follows the vehicle manufacturer’s service procedures and usually requires basic tools and access to the brake pedal area or dash mounting location. Once installed, the assembly is built to the same durability standards as the original component, helping ensure reliable operation under normal driving conditions.

• Install using GM-recommended procedures for proper alignment and electrical connections.
• Designed for long-term use, subject to standard wear and environmental exposure.
• If replacing a failed switch, test trailer brake operation after installation.

Who is this for: This GM Genuine Parts 84108373 black trailer brake control switch assembly is intended for owners, mechanics, and fleet managers who need a like-for-like OEM replacement for GM vehicles that require this specific brake control switch. It’s ideal for anyone seeking a factory-spec part to restore trailer brake signaling, maintain towing safety, and retain the original fit and function of their GM vehicle’s braking system.

Features

• GM-recommended replacement part for your GM vehicle’s original factory component
• Offering the quality, reliability, and durability of GM OE
• Manufactured to GM Original Equipment specification for fit, form, and function
• Made in China