Accessory Drive Belt Tensioner 38158 for Select 1999-2009 GM, Hummer, Isuzu & Saab Models

Accessory Drive Belt Tensioner for Select GM, Hummer, Isuzu, and Saab Models

Replacement belt tensioner assembly for the specific applications listed below. The available source identifies a complete belt tensioner rather than confirming a pulley-only replacement.

Critical fitment warning: The source does not specify engine displacement, engine code, accessory-belt routing, pulley diameter and groove count, air-conditioning configuration, production-date breakpoints, or whether more than one tensioner design was used. Do not order by make, model, and year alone. Confirm the VIN, engine label, original tensioner arm and mounting pattern, pulley position and dimensions, belt routing, and reference number.

Vehicle Compatibility

Buick

• 2004–2007 Buick Rainier

Cadillac

• 2002–2008 Cadillac Escalade, Escalade ESV, and Escalade EXT

Chevrolet

• 2007–2008 Chevrolet Avalanche
• 2002–2006 Chevrolet Avalanche 1500
• 2003–2008 Chevrolet Express 1500, 2500, and 3500
• 1999–2008 Chevrolet Silverado 1500
• 2003–2006 Chevrolet SSR
• 2000–2008 Chevrolet Suburban 1500
• 2000–2008 Chevrolet Tahoe
• 2006–2009 Chevrolet Trailblazer

GMC

• 2003–2009 GMC Envoy
• 2003–2008 GMC Savana 1500
• 1999–2008 GMC Sierra 1500
• 2000–2008 GMC Yukon

Other Applications

• 2003–2008 Hummer H2
• 2003–2006 Isuzu Ascender
• 2005–2009 Saab 9-7X

The source states that additional vehicles may exist but does not provide a verifiable additional fitment table in the current listing. Only the applications above are claimed here.

Reference Numbers

38158, 88929140, 12554027.

Reference numbers are provided for comparison. Match the original tensioner’s mounting points, arm orientation, stop locations, pulley diameter, pulley face and grooves, spring direction, belt path, and engine configuration.

Package Contents

One belt tensioner assembly. The source does not separately confirm mounting bolts, belt, idler pulleys, spacers, washers, covers, or other hardware. Review the product images before ordering.

Common Tensioner Symptoms

• Belt squeal or chirping
• Visible tensioner-arm vibration
• Weak or uneven belt tension
• Pulley bearing noise or roughness
• Belt tracking toward the edge of a pulley

Similar symptoms may also be caused by the wrong belt, contaminated or worn belts, misaligned accessories, damaged idlers, failing accessory bearings, crankshaft-pulley issues, or incorrect belt routing. Inspect the complete accessory-drive system before replacement.

Installation Notes

Professional installation is recommended. Confirm the belt-routing diagram before removing the original tensioner. Inspect the serpentine belt, idler pulleys, accessory pulleys, crankshaft pulley, and all driven accessories for wear, wobble, leakage, or misalignment. Use the manufacturer’s fastener torque procedures, ensure the belt is seated in every groove, and keep hands and tools clear of the spring-loaded tensioner path. Rotate the engine as specified and recheck belt alignment before starting. After start-up, verify stable tensioner movement and correct belt tracking.

Frequently Asked Questions

Is this only a replacement pulley?
The source identifies the product as a belt tensioner. It does not confirm that this is a pulley-only item.

Does it fit every engine offered in the listed vehicles?
The source does not specify engine size or code. Verify the VIN, original tensioner, pulley, and belt routing before ordering.

Is a new serpentine belt included?
The source does not confirm a belt, idlers, bolts, or other hardware. Review the product images before ordering.