Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2005-2018 GM passenger cars and light duty trucks.

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  2005-2018 GM Passenger Cars and Light Duty Trucks

• A tire slowly loses air pressure over a period of days or weeks.

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  Some customers may comment on a tire that slowly loses air pressure over a period of days or weeks.

Possible causes

• As wear between tire and wheel at the bead seat continues, corrosive media from the environment may intrude at the tire/wheel interface; eventually a path for air develops and a slow leak may follow.

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  As the wear continues, there may also be intrusion at the tire/wheel interface by corrosive media from the environment. Eventually a path for air develops and a 'slow' leak may ensue.

Steps to confirm (in the document’s order)

1. After a water dunk tank leak test, if the air leak is around the bead seat of the wheel, dismount the tire to examine the bead seat.

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   After a water dunk tank leak test, if you determine the source of the air leak to be around the bead seat of the wheel, dismount the tire to examine the bead seat.

2. Bead seat corrosion looks like blistering of the wheel finish, leaving a rough or uneven surface on which the tire has difficulty keeping a proper seal.

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   Bead seat corrosion is identified by what appears like blistering of the wheel finish, causing a rough or uneven surface that is difficult for the tire to maintain a proper seal on.

3. On vehicles with 32,186 km (20,000 mi) or less, repairable corrosion may total 100 mm (4 in) or less in combined length; beyond that the wheel should be replaced.

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   For vehicles with 32,186 km (20,000 mi) or less, the total allowable combined linear area of repairable corrosion is 100 mm (4 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced.

4. On vehicles that have exceeded 32,186 km (20,000 mi), repairable corrosion may total 200 mm (8 in) or less in combined length; beyond that the wheel should be replaced.

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   For vehicles that have exceeded 32,186 km (20,000 mi), the total allowable combined linear area of repairable corrosion is 200 mm (8 in) or less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced.

Repair

1. Remove the corrosion and any flaking paint with a clean-up (fine cut) sanding disc or biscuit.

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   In order to correct the wheel leak, use a clean-up (fine cut) sanding disc or biscuit to remove the corrosion and any flaking paint.

2. Once the corrosion is removed, coat the repaired area with a commercially available bead sealant; the black rubber-like coating permanently fills and seals the resurfaced bead seat.

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   Once the corrosion has been eliminated, you should coat the repaired area with a commercially available tire sealant such as Patch Brand Bead Sealan or equivalent. Commercially available bead sealants are black rubber-like coatings that will permanently fill and seal the resurfaced bead seat.

Parts

• Part number 16118: Patch Bead Sealer (1 Quart (= 0.946 L)).

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  16118 Patch Bead Sealer (1 Quart)

Caution

• Do not replace a wheel for slow air loss unless the wheel has been evaluated and/or a repair with this procedure has been tried.

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  DO NOT replace a wheel for slow air loss unless you have evaluated and/or tried to repair the wheel with the procedure below.

• If any loose coating or corrosion extends to the visible surfaces on the face of the wheel, the wheel must be replaced.

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  If any loose coatings or corrosion extend to the visible surfaces on the FACE of the wheel, that wheel must be replaced.