A Loose or worn gas cap may cause Check Engine Light to illuminate.
Problems for specific GMC Yukon Denali years:
Car problem reports
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Newest reported 2009 GMC Yukon Denali problems
The upper dash may crack, most commonly on vehicles in warm climates and exposed to a lot of sunlight. The common repair is to replace the upper instrument trim panel. Information on a technical service bulletin or extended warranty is not available at this time.