This replacement serpentine belt tensioner is just what you need to get your vehicle in good working order again! If you are hearing a whirring noise from the front of your engine or if your belt often screeches you may be in need of a new belt tensioner. This part commonly wears out between 60,000 and 70,000 Miles. If it fails suddenly it can leave you stranded.

Specifications:

  • Replaces one of many dealer part numbers including: 12580162, 8-12580-162-0, 8125801620
  • Brand new, not rebuilt or remanufactured
  • Bolts to front of engine
  • Built to strict quality control standards
  • Direct replacement for the following engines as listed:
    • V8 4.8L (8th Vin Digit C or V)
    • V8 5.3L (8th Vin Digit 0, 3, B, J, M, P, T, or Z)
    • V8 6.0L (8th Vin Digit H, K, N, U, or Y)
    • V8 6.2L (8th Vin Digit 8)

Note: For the models that use two serpentine belts, this tensioner is for the belt that drives the water pump, not the A/C system. The water pump belt is the wider of the two belts. Also the water pump tensioner uses a ribbed pulley where the A/C tensioner uses a smooth pulley,

ALSO: To ensure fit please match the 8th digit of your VIN number to the VIN code in the title. Your vehicles VIN number can be found in the lower left corner of the windshield or on your registration.

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

  1. step : Remove the intake hose (1:10)
    • Use your screwdriver to pry back the clip and break the seal on the intake hose.
    • Move it out of the way and set aside.
  2. step : Remove the serpentine belt (1:50)
    • Use your 15 mm socket and ratchet to release the tension from the belt tensioner pulley
    • Pull the serpentine belt off the engine.
  3. step : Remove and install the new serpentine belt tensioner. (2:35)
    • Check your pulleys for play, squeaking, rattling, or grinding sounds.
    • Unbolt the 15 mm bolts anchoring the tensioner pulley.
    • Replace with the new pulley from 1A Auto and bolt into place.
    • Torque to 330-35 ft lbs.
    • Use your serpentine belt diagram and the 15 mm socket and ratchet to thread the serpentine belt onto the pulleys, releasing the tension from the tensioner pulley to get the belt over the last pulley.

Tools needed for replacement:

    Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Screwdrivers & Related

  • Flat Blade Screwdriver
  • Phillips Head Screwdriver

  • Sockets - Metric

  • 15mm Socket

5.0 / 5.0
2 Reviews
5 Stars
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Good pricing with fast ship
The belt tensioner with pulley was a perfect fit with little effort to install on my 2003 Silverado 2500HD with approx. 75000 miles. All that was needed was a 15mm wrench and straight-bladed screwdriver and about a half hour of labor. Installed new serpentine belts at same time. This new tensioner remedied the bearing noise of existing OEM one.
Would recommend this product. Also A1 auto has great HOW TO videos.
December 24, 2017
Purchased
5 months ago
The right part, perfect fit for my 2001 Chevy Tahoe. I always replace the belt tensioner every other belt replacement.
October 16, 2013
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Vehicle Fit

  • 2004 Buick Rainier Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit P)
  • 2005-2006 Buick Rainier Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit M)
  • 2002-2005 Cadillac Escalade Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2002-2006 Cadillac Escalade Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2007 Cadillac Escalade Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.2L (8th Vin Digit 8)
  • 2003-2006 Cadillac Escalade ESV Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2007 Cadillac Escalade ESV Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.2L (8th Vin Digit 8)
  • 2002-2006 Cadillac Escalade EXT Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2007 Cadillac Escalade EXT Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.2L (8th Vin Digit 8)
  • 2007 Chevy Avalanche 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit 0, 3, or J)
  • 2003-2007 Chevy Express 1500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T or U)
  • 2007 Chevy Express 1500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2003-2007 Chevy Express 2500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T or U)
  • 2003-2007 Chevy Express 2500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 2007 Chevy Express 2500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2003-2007 Chevy Express 3500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 2003 Chevy SSR Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit P)
  • 2004 Chevy SSR Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit N)
  • 2005-2006 Chevy SSR Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit H)
  • 1999-2007 Chevy Silverado 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 1999-2007 Chevy Silverado 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 1999-2007 Chevy Silverado 1500 Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2002-2007 Chevy Silverado 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2003-2006 Chevy Silverado 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2005-2006 Chevy Silverado 1500 Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit B)
  • 2007 Chevy Silverado 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 2007 Chevy Silverado 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit 0, 3, J, or M)
  • 2007 Chevy Silverado 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2007 Chevy Silverado 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2007 Chevy Silverado 1500 Classic Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2007 Chevy Silverado 1500 Classic Serpentine Belt Tensioner with Pulley V8 4.8L (8th Vin Digit C)
  • 2007 Chevy Silverado 1500 Classic Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit B)
  • 2001-2003 Chevy Silverado 1500 HD Serpentine Belt Tensioner with Pulley
  • 2005-2006 Chevy Silverado 1500 HD Serpentine Belt Tensioner with Pulley
  • 1999-2000 Chevy Silverado 2500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 1999-2004 Chevy Silverado 2500 Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2002-2004 Chevy Silverado 2500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2003-2004 Chevy Silverado 2500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2003-2006 Chevy Silverado 2500 HD Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit N) V8 6.0L
  • 2001-2006 Chevy Silverado 3500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2003-2006 Chevy Silverado 3500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2007 Chevy Silverado 3500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit K)
  • 2007 Chevy Silverado 3500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2000-2005 Chevy Suburban 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2002-2006 Chevy Suburban 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2007 Chevy Suburban 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit 0, 3, or J)
  • 2007 Chevy Suburban 2500 Serpentine Belt Tensioner with Pulley
  • 2000-2006 Chevy Tahoe Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 2000-2006 Chevy Tahoe Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2002-2006 Chevy Tahoe Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2007 Chevy Tahoe Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit C) V8 4.8L
  • 2007 Chevy Tahoe Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit 0 or J)
  • 2006 Chevy Trailblazer Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit M)
  • 2006 Chevy Trailblazer Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit H)
  • 2003-2004 Chevy Trailblazer EXT Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit P)
  • 2005-2006 Chevy Trailblazer EXT Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit M)
  • 2005-2006 GMC Envoy Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit M)
  • 2003-2004 GMC Envoy XL Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit P)
  • 2005-2006 GMC Envoy XL Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit M)
  • 2004 GMC Envoy XUV Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit P)
  • 2005 GMC Envoy XUV Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit M)
  • 2003-2007 GMC Savana 1500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2007 GMC Savana 1500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2003-2007 GMC Savana 2500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 2003-2007 GMC Savana 2500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2007 GMC Savana 2500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2003-2007 GMC Savana 3500 Van Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 1999-2006 GMC Sierra 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 1999-2006 GMC Sierra 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2002-2006 GMC Sierra 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2005-2006 GMC Sierra 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2007 GMC Sierra 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2007 GMC Sierra 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit V) V8 4.8L
  • 2007 GMC Sierra 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2007 GMC Sierra 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit 0, 3, J, or M)
  • 2007 GMC Sierra 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2007 GMC Sierra 1500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit C) V8 4.8L
  • 2001-2003 GMC Sierra 1500 HD Serpentine Belt Tensioner with Pulley
  • 2005-2006 GMC Sierra 1500 HD Serpentine Belt Tensioner with Pulley
  • 2007 GMC Sierra 1500 HD Classic Serpentine Belt Tensioner with Pulley
  • 2005-2006 GMC Sierra 2500 HD Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit N) V8 6.0L
  • 2007 GMC Sierra 2500 HD Classic Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit N) V8 6.0L
  • 2001-2006 GMC Sierra 3500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2005-2006 GMC Sierra 3500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2007 GMC Sierra 3500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2007 GMC Sierra 3500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit K)
  • 2007 GMC Sierra 3500 Classic Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit N)
  • 2001-2006 GMC Yukon Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T or U)
  • 2001-2006 GMC Yukon Water Pump Belt Serpentine Belt Tensioner with Pulley V8 4.8L (8th Vin Digit V)
  • 2002-2006 GMC Yukon Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2007 GMC Yukon Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.2L (8th Vin Digit 8)
  • 2007 GMC Yukon Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit 0 or J)
  • 2007 GMC Yukon Water Pump Belt Serpentine Belt Tensioner with Pulley (8th Vin Digit C) V8 4.8L
  • 2000-2005 GMC Yukon XL 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit T)
  • 2002-2006 GMC Yukon XL 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit Z)
  • 2007 GMC Yukon XL 1500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit 0, 3, or J)
  • 2000-2006 GMC Yukon XL 2500 Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2007 GMC Yukon XL 2500 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit K or Y)
  • 2003-2007 Hummer H2 Water Pump Belt Serpentine Belt Tensioner with Pulley V8 6.0L (8th Vin Digit U)
  • 2003-2004 Isuzu Ascender Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit P)
  • 2005-2006 Isuzu Ascender Serpentine Belt Tensioner with Pulley V8 5.3L (8th Vin Digit M)

This part replaces:

  • OE # 8125801620
  • Dorman 419-112
Part #: 1AEBT00024

Ships Same Day for orders placed by 4 P.M. ET

How-to Video:

(09:38 min)