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GMPartsGiant.com offers the wholesale prices for genuine 2021 GMC Yukon XL 4WD parts. Parts like Trailer Brake Control/Jumper Harness are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.0L Diesel, 8 Cyl 5.3L. Model Code: YUKON XL/DENALI XL/ESCALADE ESV.