Theft system will not go off

Asked by May 03, 2015 at 08:19 PM about the 2006 Cadillac CTS 3.6L RWD

Question type: Maintenance & Repair

I have a 06 Cadillac cts the theft lock
comes on out the blue and will not turn off.
The key will get stuck in the ignition. I can
turn the car on and even put it in drive. Pls
help someone

11 Answers


I have an 07 Cadillac - same issue -- theft lock is on, cant turn key to "off" position - stops at accessory -- "service theft system" message comes up along with traction control icon -- makes no sense! -- a "mechanic" mentioned a non factory installed remote starter may be the problem -- still trying to get someone to disconnect that for me under dash -- very frustrating!!!!

36 people found this helpful.

I have an 06 CTS with exactly the same problem. Took it to dealership and they diognosed it as ECM gone and key lock cylinder. I have replaced the lock cylinder via locksmith, no change. New ECM comes tomorrow but I don't know if I can do the 10 minete programing when the key won't turn past ACC. I guess I'll find out if the ECM takes care of everything.

11 people found this helpful.

Sorry I forgot to update. ECM fixed all the problems and is still working just fine.

17 people found this helpful.

Bobby5876 Hey did you have to do the key relearn process once you replaced the ECM?? My car is throwing the anti theft crap and eats the key but will still start and run. Anyhow I was messing to know if I have to do the relearn process please let me know

18 people found this helpful.

Had same problem. Had to do the key relearn. After about 5 minutes my theftlock resets allowing access to systems & removal of the key. Replaced ECM & problem went away for awhile. Next step for me is the key identifier (ring around the key mounted on the ignition switch).

9 people found this helpful.

'06 CTS 3.6

9 people found this helpful.

i put a engine an i have kno dash lights an car will not start

9 people found this helpful.

Turn your key to auxiliary open the driver door leave it open. Open fuse box. Pull the anti theft fuse put back in and pull ecm fuse twice put it back. Get into car shit door start it. Turn it off. That should reset everything. It did for me. I have a Cadillac’s CT’s 2003

22 people found this helpful.

I tried disconnecting the battery, on/off 5 times but didnt work in my case. I had a key made that was bad. My son had a second key from the dealer and it took 2 attempts but it worked.

9 people found this helpful.

I was having the same problem with my radio saying Anti-Theft when I took it in there's a recall on all 07 so if you have an 07 take it in in the dealer has to do the recall but then I asked him if they could take the anti-lock off the radio and they said yeah no problem then didn't do it fix the other cuz they had to it was a recall but wanted me to pay $1,000 for a stock radio they said when they put in the stock radio it would work out of their shop but when they will put back in mines they couldn't program it but the all sevens and not anti-lock stuff has a recall so take it to the local dealership and they have to do it for free

7 people found this helpful.

I had the same problem on my 06 Cadillac CTS 3.6 L. I definitely think it is something defective with the Cadillac CTS models made from about 2003-2007 because my brother had the same problem on his 04 CTS. Anyways, my car would not start because of the anti-theft system, and it would not allow me to take the key out. This would happen out of the blue, especially when it hadn’t been started in a while. To fix this, the previous owner installed an override button under the ignition by the center console trim. The button basically allows me to push it with my left hand while I’m turning the key (if the car won’t start), and it starts almost every time unless I need a jump. I highly recommend this as an option for anyone who is having this problem. While it isn’t ideal, it fixes the problem and will allow you to get through it in the future, which is very useful because the service theft/anti- theft system seems to be a recurring problem for those that have issues with it.

2 people found this helpful.

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