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There are several different styles of remote transmitter key fobs used on GM products; depending on which exact part number you had, the cost ranges from about $45 to around $65 for a new transmitter.
The cost of a replacement key is around $5.
On this model year, if you call your local GM dealership parts department they can cut a new key for your vehicle without having the old one to copy. All they need is the vehicle's VIN number (on your registration card, or visible on a small plate on the top of the dash on the drivers side if you look in through the windshield). If you call them and give them this number, they can determine exactly what transmitter is required, and can look up your key cutting information very quickly. Then, you can get a ride there and pick up your new key and transmitter; no call to a locksmith or tow truck is required. You will likely need to take along proof of ownership of the vehicle (such as a registration card and drivers license) if they do not know you before they will sell you the key though. Also, after you get the car started you will need to program the new transmitter to the vehicle before it will operate.
Here is the transmitter programming procedure:
Perform the following steps:
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