RE: 2004 Cadillac CTS Start Failed
Something went wrong with the security system on your car. Try the other key before you do anything else. Did you lose a key? Had a new one made and did not get the key learned to the system. If your other key works try this, with the key that is good, meaning the car starts, turn the key to the on position, not start, just on. After the little security light goes out, looks like a lock, you have 10 seconds to learn the next key. again, put good key in, turn to on, wait for security light to go out, remove key, put new key in or the one that doesn't work in the ignition and turn ON and wait for security light to go out. This should work. Other wise you ECM and or the vehicle theft module went bad.