{"product_id":"gm-20904439-trailer-brake-continue-relay-assembly-oe-fit","title":"GM 20904439 Trailer Brake Continue Relay Assembly - OE Fit","description":"\u003cp\u003eIn this review the GM 20904439 Trailer Brake Continue Relay Assembly is evaluated as a straightforward replacement relay for GM tow-ready trucks and SUVs. The bottom line: this relay is for owners who need an OE-validated, plug-in fix that restores trailer brake control without diagnosis guesswork. The reviewer found it true to General Motors standards, easy to fit in a few minutes on compatible models, and a practical choice when the trailer brake system needs a reliable electro-mechanical switch that matches factory specifications.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOE validation:\u003c\/strong\u003e Designed and tested to the rigorous standards of General Motors, offering confidence that the relay matches factory intent and durability expectations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect fit:\u003c\/strong\u003e Functions as a plug-in replacement for compatible GM vehicles, reducing installation time and eliminating the need for modifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrailer brake control:\u003c\/strong\u003e Provides the specific electro-mechanical switching functions required by a vehicle trailer brake system, helping restore correct trailer operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBacked by GM:\u003c\/strong\u003e Supported by General Motors engineering and validation, which reassures buyers seeking OEM authenticity and traceable quality.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpdated design lineage:\u003c\/strong\u003e Some parts were formerly listed under ACDelco GM Original Equipment, reflecting ongoing updates to materials and technologies in production and service parts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis relay is aimed at Chevrolet, GMC, Buick, and Cadillac owners who tow regularly and prefer factory-authenticated replacement parts. It is particularly well suited for technicians and owners who want a quick, reliable repair for trailer brake issues without custom wiring or fabrication.\u003c\/p\u003e\u003cp\u003eThose seeking universal aftermarket relays with adjustable features or multi-function controllers should look elsewhere, as this part is a factory-style relay intended to restore original trailer brake relay functions rather than add new capability.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFactory-matched design provides strong fit and compatibility with GM tow systems.\u003c\/li\u003e\n\u003cli\u003eMany owners report simple installation and immediate restoration of trailer brake function.\u003c\/li\u003e\n\u003cli\u003eBacked by GM engineering and updates that reflect current production standards.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDoes not add configurable features; it replaces factory functions only.\u003c\/li\u003e\n\u003cli\u003eSome users report mixed messages around service codes, which may require additional diagnostics.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct name\u003c\/td\u003e\n\u003ctd\u003eGM 20904439 Trailer Brake Continue Relay Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGM GENUINE PARTS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eElectro-mechanical relay for trailer brake control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment note\u003c\/td\u003e\n\u003ctd\u003eOE replacement for compatible Chevrolet, GMC, Buick, Cadillac tow systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign origin\u003c\/td\u003e\n\u003ctd\u003eEngineered and validated by General Motors; some legacy listings under ACDelco GM OE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eTrailer tow relay functions and related control circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe GM 20904439 relay is a practical OE-style replacement for owners who need reliable trailer brake switching restored quickly. It offers solid value because it fits as intended, installs in minutes, and carries the reassurance of GM validation, making it the sensible choice for factory-aligned repairs on tow-capable GM vehicles.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill this relay fit my GM truck?\u003c\/strong\u003e\u003cbr\u003eIt is intended for compatible Chevrolet, GMC, Buick, and Cadillac trailer tow systems; confirm fitment against your vehicle's parts list before purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation difficult?\u003c\/strong\u003e\u003cbr\u003eMost owners report an easy, quick plug-in replacement that can be completed in minutes by a technician or competent owner.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this relay add new trailer control features?\u003c\/strong\u003e\u003cbr\u003eNo, it restores original factory relay functions rather than providing configurable or aftermarket features.\u003c\/p\u003e","brand":"GM GENUINE PARTS","offers":[{"title":"Default Title","offer_id":48198213959899,"sku":"B00559VPK0","price":45.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/41EqyZlGe-L._AC_SL1500.jpg?v=1770310249","url":"https:\/\/gearmusthave.com\/products\/gm-20904439-trailer-brake-continue-relay-assembly-oe-fit","provider":"GearMustHave","version":"1.0","type":"link"}