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GMC 12700588 Belt Tensioner

2020-2023 GMC Sierra

Customer Questions & Expert Answers (2)
12700588 GM Belt Tensioner Illustration 1 of 1
  • Part Description
    Tensioner, Engine Cooling
  • Replaced By
    12735533
  • Manufacturer
    General Motors
Make sure this part fits
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  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine GMC
    Manufacturer Part Number12700588
    Part DescriptionBelt Tensioner; Tensioner, Engine Cooling
    Item Dimensions6.7 x 4.3 x 4.3 inches
    Item Weight2.20 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12700588
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2020-2023 GMC Sierra8 Cyl 6.6L DieselCREW CAB 1 TON CHASSIS 137.0, CREW CAB 6'6" BOX 1 TON, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 1 TON, CREW CAB 8' BOX 3/4 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 1 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CREW CAB 1 TON CHASSIS 161.5, REGULAR CAB 1 TON CHASSIS 137.0, REGULAR CAB 1 TON CHASSIS 161.5, REGULAR CAB 8' BOX 1 TON, REGULAR CAB 8' BOX 3/4 TON
  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 12700588 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    Is the pulley included? Posted by Marc D. / 2019 Medium Truck Silverado 4500HD / 5500HD / 6500HD (2WD)
    A:
    The new part number is 12735533, and it includes the pulley.
    Answered by GM Parts Specialist Bob / Oct 03, 2025

Genuine GM Part 12700588, the Right Choice

To ensure reliability, purchase GM part # 12700588 Belt Tensioner. It is sometimes referred to as GMC Timing Belt Tensioner, GMC Timing Chain Tensioner. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific GMC Sierra models.

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