GM 12673657 Belt Tensioner 2017-2026 L5P Duramax Diesel Silverado Sierra

Replace your worn, noisy, or failing belt tensioner with this Genuine GM Belt Tensioner Assembly, part number 12673657, designed for 2017–2026 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks equipped with the 6.6L L5P Duramax diesel engine. The automatic belt tensioner maintains proper tension on the engine's serpentine/accessory drive belt. As the tensioner wears, the pulley bearing or internal spring mechanism can develop excessive movement, noise, or insufficient belt tension, potentially causing belt squeal, vibration, improper accessory operation, or premature belt wear. This Genuine GM replacement is manufactured to OEM specifications for proper belt alignment, tension, fitment, and long-term reliability. Features & Benefits: - Genuine OEM GM component - Complete belt tensioner assembly - Direct replacement for the factory tensioner - Maintains proper serpentine belt tension - Helps maintain correct belt alignment - Helps eliminate noise caused by a worn tensioner - OEM-quality fit, function, and durability - Ideal replacement during serpentine belt or accessory drive service - Made in Canada Part Information: Brand: Genuine GM GM Part Number: 12673657 UPC: 808709528968 Fitment Applications: 2017–2026 Chevrolet Silverado 2500HD / 3500HD – L5P Duramax 2017–2026 GMC Sierra 2500HD / 3500HD – L5P Duramax