* Radio Code: This is the most common "security code" people ask about. If your radio is locked, you'll need the radio's specific code. This code is tied to the radio's serial number, *not* the car itself. You'll likely need to find your radio's serial number (usually a sticker on the radio itself) and contact a Cadillac dealer or a radio code retrieval service with that number to obtain the code.
* Passive Anti-Theft System (PATS): This system prevents the car from starting if the correct key isn't used. There's no "code" to bypass this; it's tied to the car's computer and the transponder chip in your key. If you've lost your keys, you'll need to have new keys made at a dealership or locksmith specializing in car keys, and they will likely need to access and potentially replace the car's PATS system components.
* Other Security Features: The Catera might have additional security systems like an alarm system, which may have its own codes, but these are typically separate from starting the car.
In short: You need to specify *which* security code you're looking for. If it's a radio code, find your radio's serial number. If it's a starting problem, you'll need a locksmith or dealership to help with the PATS system.
