I lost the keys, so i had the cylinder changed. Now it's saying starter disabled
My car has 50000 miles.
My car has an automatic transmission.
It sounds like the new key needs to be encoded with the powertrain control module (PCM). The original key has a resistor in it with a specific resistance value. If the PCM sees a different resistance value, it will disable the starting system. This is the theft deterrent in action. Hopefully, you have a new key that has a resistor in it. If so, the new key will need to be initiated with the system.
Doing this on your Cadillac may require a professional scanner that is usually very expensive. On most GM vehicles, there is a key relearn procedure that does not require a scan tool. I have used this procedure on many other GM cars and some Cadillacs. Sometimes this works and other times it requires the scanner. The only way to know for sure is to try. The procedure is as follows:
If you need any further assistance, I recommend contacting a professional in your area with the necessary equipment to do this for you. Or, if you've encoded the new key with the PCM and are still having problems, you may want to consider contacting a certified technician, such as one from YourMechanic, to diagnose and replace your starter. Good luck!
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