Once the BCM2 module is read, you can make as many dealer keys as you want. A brand new key is needed for the dealer key. Such a key can be made as a dealer key several times, but if you learn this dealer key to the car, it is locked during the key-learning procedure and cannot be used on other cars. Once you have the required count of pre-coded dealer keys, you can learn them. Also the original keys should be re-learned in this step, otherwise they will no longer function.