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Posted on Dec 31, 2010
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The anti theft isn't recognizing my key, and will not allow my 2003 CTS to start. What could possibly be wrong?

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  • Posted on Dec 31, 2010
Anonymous
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This comes from personal experience on my Mother's '03 Impala. Apparently the chip in the key died. Tried the spare key that came with the car and it all works again. If this solves your problem (as it did mine) just go to your dealership and have a new key cut.

  • tug_quint Dec 31, 2010

    I tried the second key, and it didn't work either. The second key is now stuck in the ignition...

  • Anonymous Dec 31, 2010

    I'm sorry it didn't for as it did for me. However, I'm puzzled about the key getting stuck in the ignition.

    Do you have a separate, different key to open the trunk?

    If so, you didn't put that key in the ignition switch, did you?

    Assuming this isn't the case, then it would appear you have a faulty ignition lock assembly. They're not too difficult to replace. You best bet, if you want to pursue this yourself, would be to get a vehicle specific repair manual at your local auto parts store . They typically will clearly outline how to affect this repair.

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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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Passlock indicator is flashing and i am unable to start car

possible key worn down enough not to be recognized setting off anti theft --other problem ignition cylinder worn or damaged and not recognizing key -try turning vehicle to on [not try to start] position and leave in position for about 15 min than turn off for 10 seconds than try s
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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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2003 CTS Anti Theft recall request info to fix this at dealers!!!

Cadillac did send out recalls on the key issue. I have a 2004 cts and they took care of the problem free of charge.
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Anti-theft system?

MY CAR STARTS BUT WANT GO INTO GEAR AND THE KEY WANT COME OUT
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