BAITHNA Trailer Brake Control Relay 20904439 — GM OE Fit for 2007–2014, Restores Trailer Braking, 1-Year Warranty

BAITHNA's GM 20904439 Trailer Brake Control Relay is a direct-fit replacement relay built to GM original equipment specifications for reliable trailer brake operation.

This relay assembly replaces the factory trailer brake control relay on many GM vehicles. Designed and manufactured to meet GM OE fit, form, and function, the part restores proper trailer braking signals and wiring compatibility after a relay failure. It’s offered with a one-year warranty and cross-references several GM part numbers for easy ordering.

Which vehicles and part numbers does this relay fit?

This BAITHNA relay is compatible with numerous GMC and Cadillac models and their heavy-duty siblings across model years primarily between 2007 and 2014. It cross-references GM part numbers so you can match it to your vehicle’s original relay or an aftermarket listing.

• Common replacements: 20904439, 2090-4439, 25792959, 25848909, 25837945, 15819418.
• Typical applications: Escalade, Escalade ESV, Escalade EXT, Avalanche, Silverado 1500/3500 HD, Suburban, Tahoe, Sierra 1500/2500 HD, Yukon.
• Years covered: Mainly 2007–2014 model years for listed platforms; check your VIN and existing relay number for exact match.

How does this relay help when towing or replacing a failed part?

When a trailer brake relay fails, it can interrupt the signal that controls trailer braking, leading to reduced towing control. Installing this BAITHNA relay restores the electrical switching required for trailer brake modules and maintains compatibility with GM vehicle harnesses.

• Restores trailer brake signal path and timing per GM design.
• Fits factory relay sockets—no wire cutting or splicing in most cases.
• Manufactured to GM OE specifications to match original fit and electrical behavior.

What quality and warranty can I expect from this replacement relay?

The relay is produced to meet GM original equipment specification for fit and function, offering durability comparable to the factory component. BAITHNA provides a one-year warranty that covers defects and allows for refund or replacement if the relay fails under normal use during the warranty period.

• Built to GM OE standards for consistent fit, form, and function.
• One-year replacement or refund warranty—contact seller if issues arise.
• Tested for electrical reliability to match factory relay performance.

How do I confirm compatibility and install the relay?

Verify compatibility by comparing the part number on your original relay to the listed cross-reference numbers, or consult your vehicle’s service manual. Installation is typically straightforward: remove the failed relay from the relay block and plug in the replacement, ensuring correct seating and any securing clips are engaged.

• Match your existing relay number to cross-reference list before purchase.
• Installation: unplug the old relay, seat the new relay into the same socket, secure any retention clips.
• If uncertain, have a qualified technician confirm wiring and perform installation.

Who is this for? Drivers and technicians who tow with GM trucks and SUVs or who need a reliable, OE-spec trailer brake relay replacement will benefit most from this BAITHNA GM 20904439 assembly. It’s suited for owners of Escalade, Silverado, Tahoe, Yukon, Suburban and similar GM models within the specified years, as well as repair shops seeking a direct-fit relay that restores factory trailer brake operation.