Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2013 and prior passenger cars and light duty trucks, including Saab and Saturn.

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  2013 and Prior Passenger Cars and Light Duty Trucks including Saab and Saturn

• The customer notices a noise or vibration that seems abnormal and may not have been there when the vehicle was new.

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  Some customers may notice a noise or a vibration in their vehicle that seems to be abnormal and may not have been there when the vehicle was new.

Possible causes

• Step bars/nerf bars that touch both the truck frame and the cab without insulation carry the noise of a normally operating drive train into the passenger area.

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  For example, the popular "step bars/nerf bars" that contact both the frame of the truck and the cab without any type of insulation are a noise transfer path of a normally operating drive train into the passenger area of the vehicle.

• Other known contributors are running boards, bug shields, sun visors, vent shades, emergency lights, custom grilles, ski racks and bicycle racks.

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  Some other known contributors to noise and vibrations are running boards, bug shields, sun visors, vent shades, emergency lights, custom grilles, ski racks, bicycle racks, etc...

Steps to confirm (in the document’s order)

1. The first diagnostic step is to evaluate the vehicle for any after-market accessories.

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   The first step in diagnosis of a concern of this nature is to evaluate the customer vehicle for any after-market accessories.

2. These items must be removed to evaluate whether they contribute to the concern.

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   Removal of these items, while many times not popular with the customer, is necessary in order to evaluate whether they contribute to the customer's concern.

Caution

• If the root cause is a non-GM aftermarket accessory, no warranty claim should be filed; it is a customer pay item.

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  If the root cause is identified as a non-GM aftermarket accessories product, a warranty claim should NOT be filed against the repair, rather, this should be customer pay item.