One problem related to anti-theft controller has been reported for the 2005 Cadillac CTS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Cadillac CTS based on all problems reported for the 2005 CTS.
I was driving home from work when the security light came on the dash and a "service anti theft system" message came on the radio. The entire dash quit working, radio went off, power steering stopped working and I was driving without knowing how fast I was going or what was going on. After I got the car home and parked it, I shut it off and came inside. When I went out the next morning to start it, nothing happened. The dash lights up, everything works but the gas gauge and temperature gauge, but the car doesn't start or even attempt to turn over. The security message and service air bag message shows on the radio. I was told that it may be the key so I purchased a new one from moses Cadillac and attempted it but a new message came up "ignition start disabled, remove key. " I can't do anything with it, the entire car is locked up and won't start so I can't even get it to the dealer to be looked at. When you're in it and turn the key on all the doors lock, you can hear the fuel pump start, and nothing else. The key locks itself into the ignition, I had to access the manual release to get it out of the car.