Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2024 and prior GM passenger cars and trucks.

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  2024 and Prior GM Passenger Cars and Trucks

Possible causes

• A variety of chemicals can cause crazing or cracking of the polycarbonate lens.

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  A variety of chemicals can cause crazing or cracking of the polycarbonate lens.

• Bulbs with a higher output than original equipment run hotter, and the excess heat can melt the socket, housing or lens.

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  Because the bulb output is higher, the operating temperature is also higher. This excessive heat can melt the socket, housing, or lens.

Steps to confirm (in the document’s order)

• Broken mounting tabs, rear housing fractures and loose components inside the lamp assembly are evidence of impact damage.

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  Broken mounting tabs, rear housing fractures, and loose components inside the lamp assembly are evidence if impact damage.

Repair

• When servicing any exterior lighting assembly, transfer any electrical connection seals to the new part.

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  When servicing any exterior lighting assembly, be sure to transfer any electrical connection seals to the new part.

Caution

• Clean exterior lamps and lenses only with lukewarm or cold water, a soft cloth and a car washing soap.

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  Use only lukewarm or cold water, a soft cloth and a car washing soap to clean exterior lamps and lenses.

• Do not let a shop mat or fender cover drape over a headlamp while the DRL or headlamps are on; the lens may craze or deform.

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  Crazing or deformations of the lens may occur if a shop mat or fender cover is draped over the fender and covers a portion or all of the headlamp assembly while the DRL or headlamps are on.