Learn to program the remote to your GMC Sierra without any help from the dealer.
The GMC Sierra is a pickup truck that shares its components with the Chevrolet Silverado. Like the other, the Sierra doesn’t come standard with remote keyless entry, although you can program a remote key fob to the truck if it came with the factory installed option. You can generally identify the Sierra trucks with factory keyless entry by looking at the door locks. If the truck has power door locks, it likely has keyless entry.