Locate the GM Service Parts Identification Sticker. (Possible locations: Glove Box, Cargo Access Door, Bottom Side of Trunk, Spare Tire Cover) If the code AU0 is present then the vehicle is equipped with the factory keyless entry system.
GM Single-sided VATS Transponder Keys were standard on this vehicle. You can have the key cut to match your existing key by any locksmith. In order for us to give you the correct key you will need to measure the Ohms of the chip on the keyblade.