Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Problems for specific GMC Yukon years:
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Repairpal verified 2009 GMC Yukon problems
The inside door handles are prone to breaking.
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.
The power door lock actuators may become slow to operate or stop working completely and require replacement.
The inside and outside door handles are prone to breaking.