I have an 06 DTS and have suddenly been given the message to "service theft deterrent system." I reprogrammed the key-fob in question and it is now working properly. The problem comes with the spare keys we had made for the vehicle. The original key that has the Cadillac emblem on it will always start the car but neither of the spare keys will start the car. As soon as I, be it either remote start or manual start, insert the spare key into the ignition, the message shows up on the DIC and the car shuts off. When I purchased the car the dealer said the keys for this year DTS DO NOT have any chip in them to make them proprietary to this vehicle, but considering the only key that works is the original, I can't help but think he didn't know what he was talking about.
What can I do about this? Do I need to take it to the dealer and get authentic Cadillac keys or is there something else I'm missing?
What can I do about this? Do I need to take it to the dealer and get authentic Cadillac keys or is there something else I'm missing?