BAITHNA Trailer Brake Relay Assembly 20904439 — Direct-Fit OE Replacement for GM Trucks/SUVs

This relay assembly meets GM original equipment specifications for fit, form, and function and is intended as a like-for-like replacement for worn or failed trailer brake relays. Built to the same standards as GM OE components, it restores the electrical switching needed for trailer brake control systems on a range of GMC, Chevrolet and Cadillac vehicles. The part cross-references include 20904439, 2090-4439, 25792959, 25848909, 25837945 and 15819418.

What vehicles is this relay compatible with?

This relay is designed for many GM full-size trucks and SUVs from model years roughly 2007–2014. It fits original factory brake control systems on select Chevrolet, GMC and Cadillac platforms when the listed part numbers match the vehicle's existing relay.

• 2008–2014 Escalade, Escalade ESV, Escalade EXT
• 2008–2013 Avalanche; 2008–2014 Suburban and Tahoe
• 2008–2013 Sierra and Silverado 1500; 2007–2014 Sierra and Silverado 2500/3500 HD
• 2008–2014 Yukon and compatible GM platforms using the referenced part numbers

How does this GM relay match the original part?

The assembly is manufactured to GM Original Equipment specifications for mechanical fit, electrical connections and operating characteristics. That means the plug pattern, mounting points and electrical ratings replicate the factory relay so installation is straightforward without modifications.

• OE-level construction for consistent electrical switching
• Same connector layout and mounting footprint as factory part
• Engineered to meet GM durability and reliability standards

What installation and performance details should I expect?

Installation typically involves unplugging the old relay and plugging in the replacement; some vehicles may require access behind dash panels or under the dash fuse/relay center. Once installed, the relay performs as the electrical control for the vehicle’s trailer brake system, maintaining signal routing between the brake controller and tow wiring.

• Direct-swap replacement—no splicing or adapter usually required
• Compatible with factory trailer brake controllers and wiring harnesses
• Manufactured to OEM spec for consistent operation under typical driving conditions

What warranty and support come with this relay?

The product includes a one-year warranty for defects or failures related to manufacture or materials. If an issue arises during the warranty window, contact the seller for a refund or replacement to address covered problems.

• One-year limited warranty for replacement or refund
• Seller support for cross-reference and fitment questions
• Replace part numbers listed to confirm compatibility before purchase

Who is this for? The BAITHNA GM Genuine Parts 20904439 relay assembly is intended for owners, technicians and fleet managers who need an exact-fit replacement for a factory trailer brake relay on compatible Chevrolet, GMC and Cadillac trucks and SUVs. If your vehicle uses one of the referenced part numbers and you want an OE-spec component to restore trailer brake system switching, this relay provides the same physical and electrical characteristics expected from a GM original equipment part.