Manufacturer communication — 2006 GMC YUKON DENALI XL

• The model list covers 2003-2013 Cadillac Escalade, Chevrolet Avalanche, Silverado, Suburban, Tahoe and GMC Sierra and Yukon models, plus the 2003-2009 Hummer H2 (note: the Yukon range runs to 2013).

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  2003-2013 Cadillac Escalade Models 2003-2013 Chevrolet Avalanche, Silverado Classic, Silverado, Suburban, Tahoe 2003-2013 GMC Sierra Classic, Sierra, Yukon Models 2003-2009 Hummer H2

• Owners may report a whine noise that normal diagnostics trace to the power steering pump, most commonly heard between idle and 2000 rpm.

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  After normal diagnostics you may find the noise to be coming from the power steering pump. This whine noise is most commonly heard between idle and 2000 rpm coming from the power steering pump.

Possible causes

• A new design power steering pump that helps improve or eliminate this noise was introduced with the new body style pickups and utilities from model year 2007 and the 2008 H2.

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  Beginning with model year 2007 the new body style pickups and utilities along with the 2008 H2, a new design power steering pump was introduced which will help improve or eliminate this noise concern.

Repair

1. GM dealers report that flushing and refilling the power steering system with Lucas Power Steering Fluid with Conditioners has reduced or eliminated the noise; GM Engineering has not evaluated this product.

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   GM Engineering has not evaluated this product, but reports from GM Dealers of flushing and refilling the power steering system with Lucas Power Steering Fluid with Conditioners, have reduced or eliminated this noise.

2. For vehicles built before that change, or if the Lucas fluid is not readily available, install the latest design GM power steering pump, looking up the part number in the GM Electronic Parts Catalog (EPC).

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   For vehicles built prior to this change or if Lucas Power Steering Fluid with Conditioners is not readily available, install the latest design GM power steering pump available through GM CCA. Use the GM Electronic Parts Catalog (EPC) to look up the correct part number for your application.

3. The warranty labor operation is E9523, Flush and Bleed Power Steering System, 0.9 hour.

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   E9523* Flush and Bleed PowerSteering System 0.9

Parts

• The fluid is Lucas PN 10442, a synthetic base fluid sold in pint containers at most auto parts stores; most applications need 6 to 8 pints to flush and fill the system.

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  Lucas Power Steering Fluid with Conditioners, (Lucas PN 10442), is a synthetic base fluid and is available at most auto parts stores in pint size containers. In most applications, 6 to 8 pints will be needed to flush and fill the system.