2003 Cadillac CTS Logo
Posted on Jul 10, 2008

Anti-theft system? My 2003 cts out of no where started displaying something about the anti-theft system, and shortly afterward, The whole car shut down, we couldn't even take the key out. the dealer tried to do a diagnostic test, but they gave me the answer "we don't know whats wrong with it!" I got frustrated with them so I pulled it out of their shop, and now I'm not too sure on where to take it, does any one know what I need to fix it?

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  • jennblas Sep 09, 2008

    We have the same anti theft problem. The key is in the ignition, and will not come out. If anyone has a solution, please let us know.

  • kenbo161 Oct 10, 2008

    my 2003 is doing the same . can't get the key out of the ignition , veh won't start , radio is not comming on and is showing service theft system across front of it

  • CTS_Sally Nov 05, 2008

    The same problem happened to me in February. We replaced the battery and everything was fine. This time we can not remove the key nor will the gears shift. We removed the battery cable a couple of times and removed/replaced the battery and the key still will not come out and the gears will not shift. The dealership wants $150 just to put it on the machine. Oh and when we called them about the problem this time they told us to remove/replace the battery cable and all should be ok. (NOT).

  • Anonymous Dec 02, 2008

    Wut Fuse Number was it on the box i have the same problem

  • josebarajas Dec 15, 2008

    I have an 03 CTS with the same problems. It wont shift, the key wont come out and it is marking "TC" and the anti theft yellow icons on the dash. To top it off my gas gauge is not working.

  • anzza Feb 19, 2009

    hi, i have the same problem with my cadillac cts 06, it starts, but the key couldn't come out, it doesn't shift out of park, traction control lights on, and service theft system is displayed......the hic , is that, there is no GM dealer in my country (libya) plz did any one had yhe same problem and got it fixed ? [email protected]

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  • Posted on May 08, 2009
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MY CAR STARTS BUT WANT GO INTO GEAR AND THE KEY WANT COME OUT

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  • Posted on Nov 04, 2008
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I am dealing with the same problem with my 03 CTS. Everytime I have this issue I have to play around with the theft fuse found under the hood, and my car finally starts. I dont push the fuse all the way back in until I start the car. I just lay it on top until I here a clicking sound and fiddle with it and finally it starts and once it does I just push it back in, close the hood and be on my way. Eventually I have to get it fixed but this is working for now

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  • Posted on Aug 09, 2012
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Mmm well my cadillac dont turn on for nothink just the alarm and lights all i did was checking the fuses and then it shut off

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I have the same problem and I boost the car with the battery under the back seat and it will be fine for 2-3 month. It usually happens when it rains or is damp out

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  • Posted on Sep 13, 2008
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I recently had the same problem, it was the crank sensor.

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I am thinking about buying a 2003 cts. Should I do this?

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My 2003 Cadillac CTS starts then immediately dies. Causes please.

Question edited for clarity.
Question moved to model category.

By disconnecting the battery, you also disconnected all the set up of the security and engine immobilizer coding.

https://www.google.com/search?q=2003+cadillac+cts+security+system+reset

How do i perform the 2003 Cadillac CTS anti theft reset?

Vehicle History https://www.vehiclehistory.com > questions > how-do-...
To reset the anti-theft system in your 2003 cadillac cts depress the key fob's panic button for five seconds before pressing the lock button twice standing ...
2 answers · Top answer: To reset the alarm on the 2003 Cadillac CTS You have two options. You can pop the hood and disconnect the positive battery cable, then leave it off for ... People also ask
How do I get my Cadillac out of anti-theft mode?"

Look for a button that allows you to slide the physical key out of the fob. Step 2: Turn the vehicle key to unlock the car door without releasing it. Hold the key for 30 seconds in this position. This will signal to your car's system that you have the right key, and will enable you to bypass your car's alarm system.
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2006 cadillac cts anti theft problem

Very strange. You need a professional with a high level scan tool that can collect freeze frame data, to find out what is going on when this happens. It sounds a bit like it is going into Limp Mode, but it shouldn't shut off.
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Why won't my 2003 cadillac cts start with the new theft deterrent module?

there is one wyre you can cut coming from the computer check itrenet taht will disable antitheft everything else will work properly that will let you no if it is the anti theft
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My 2003 cts won't start when it's cold outside. I've checked the battery SnF the alternator and I also had a new fuel filter and pump put in. Sometimes when it doesn't start it'll say service theft system...

Have your dealer or a qualified Cadillac mechanic check the anti-theft system and your key. Your ECM may need to be re-flashed, but have a diagnostic scan performed to determine possible solutions.
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2003 Cadillac CTS won't start after disconnecting battery

Don't do that again! You will need to re-boot the on board computer system by entering a code. Call your nearest Cadillac dealer.

If you need further help, reach me via phone at https://www.6ya.com/expert/lloyd_4256582adacd68ee

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I have a cadillac 2003 cts car and come out theft system how can desactivated can you help me please

Hi,
If your portable remote is not work , you may need to replace the battery with new one. If it not work , you need to disconnect power supply into your security system / immobilizer / anti theft.
Regards, Jay
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I have 2003 cad cts mt new battery,new starter

does the vehicle have an anti theft device on it if so it may need to be reset. usually all you have to do is unlpug the negative batt cable. for about 5 mins.and reconnect it. if this does not solve the problem look i the owners manual to see how to override the system.
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