Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Chevrolet Avalanche Problem Reports
RepairPal Verified Chevrolet Avalanche Problem Reports
The keyless entry system may stop working. Our technicians tell us the key fobs and keyless entry receiver may need to be replaced to correct this fault.
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.