What you will find is the key is probably chipped which means the key will have to be set to the car via frequency the dealer does do it. But it costs more then just the key if you buy just the key without it set to the cars code it will only unlock the car but not start it. Depending on model of vehicle an stuff. Most dealers do cross over an sell other types of keys rather than just buick or gmc. Call lynn in servixe she will help you out.
Someone has it listed on eBay for $4.97, free shipping.
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