Question about Cadillac CTS

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I have a CTS 2004. The key jams in the switch and won?t start the engine. I took to GM dealer and they replaced the PCM it worked fine for a week. Now, the issue is back again key jams engine won?t start.

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Have you try the 2nd key for the 2nd ECM?

The item at fault is transponder unit.

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Posted on Jul 15, 2009

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I hope you have the right key or maybe you should change the ignition.

Posted on Jul 15, 2009

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2 Answers

2004 cadillac cts wont crank at all, i turn the key and try to start it but it doesn't crank or do anything just the dashboard light come on and the engine light flickers then it wont release the key


I had something similar happen on my 2004 CTS. The car would not crank, and I recall the security light was on the dash. The key could be turned off, but not quite far enough to be removed.
The key can be removed by sticking a small pin or screw driver in a hole under the steering column... maybe 2 inches from the actual steering wheel. I recall there is a small cover or plug in the hole that needs to be removed.
You can let it sit and occasionally try to start it. My did start once more.
I ended up having it towed to the GM dealer and they replaced the ECM for about $500? That took care of it for a couple years, until I recently sold it.

Mar 14, 2015 | 2004 Cadillac CTS

1 Answer

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.

Nov 28, 2011 | 2003 Cadillac CTS

1 Answer

2005 Cad CTS 3.6. Car won't start...all electrical appears to be functioning...battery is fine...all battery connections seem fine...when key is turned there is a single click and then nothing...


when key is turned there is a single click and then nothing happens. Where do you hear this click coming from ? Before you replace parts you should test the electrical circuits , if you don't know how i suggest you take it to a qualified repair shop .
Viewing wiring diagrams to see what all is involved in the starting of the vehicle , reading how it's suppose to work in factory service repair manual .
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM) to command starting. Battery voltage also travels through the switch side of the Run/Crank relay then through the clutch switch, if equipped with manual transmission, and on through the coil side of the Starter relay and then to the ECM. The ECM receives class 2 information from the vehicle theft deterrent (VTD) and transmission control module (TCM) to verify that all parameters are met for starting. When all parameters are met the ECM grounds the control circuit of the Starter relay closing the switch providing battery voltage to the starter solenoid through a 30 A Maxi-Fuse.

Are the battery cables good ? Voltage drop testing

Starter Voltage Drop

Test the control side of the circuit at the relay . Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size . Under system click on engine .Then under subsystem click on starting . Click the search button then the blue link . Pretty complex looking isn't it . Using a factory scan tool at the dealer makes diagnosing a lot simpler . Can view data to the PCM , start signal from the ignition switch , Starter relay control , see input from transmission park neutral safety switch .

Feb 28, 2018 | 2005 Cadillac CTS

1 Answer

I have a 2004 Cadilac CTS we bought a replacement chip key which the Chev Olds dealer could not program I took the new key to a Cadilac dealer they told me the key is defective now the Chev dealer has...


Okay, to program a key you will need two keys that are already programmed, insert one key ignition turned on and engine off, remove the key and within 10 sec insert the second key and turn ignition on with engine off, remove that key and within 10 sec insert the key to be programed. you will need to do a 30 min.relearn with only one key,you will turn ignition on with engine off and wait about 10 min until light goes out then remove the key and repeat this step when light goes out repeat step one more time then use key to start car, computer has learned all info. you will now turn off engine, insert programmed key turn key on engine off then remove the key and insert key to be programed within 10 sec.all done good day.

May 27, 2011 | 2004 Cadillac CTS

1 Answer

I have a 2004 Cadillac CTS and about a week ago the key got stuck in the ignition. We were first told that the battery was bad and needed to be charged. Well that didn't work and we took it in to an auto...


if the pcm is not communicating with the car you may have to program your cars vin number into the computer.or have the computer flashed at a dealer the reprogramed with your cars vin number

Jan 19, 2011 | 2003 Cadillac CTS

2 Answers

Hi, I have a Cadillac CTS 04, and periodically the "Security Theft System" will come up and the car cannot start and the key will not come out. We have disconnected the battery and the car seems to be fine...


Hello, I also have a 2004 CTS and I suspect you may have a problem with the key you are using to start the car. The key is hard-coded to the car with a small electronic chip (resides inside the key). If this chip is damaged or not communicating with the car at the time its entered into the ignition, the car's security system assumes you are trying to steal the car with a bogus key. If you have a spare key, I recommend using that one or have the key replaced by the dealer.

Aug 15, 2010 | 2004 Cadillac CTS

2 Answers

I have a 2005 cadillac cts with 90,000 miles and


Have the transmission fluid changed/new filter and use a premium synthetic fluid instead of cheap ol generic fluid. Think mobil1 full synthetic for the tranny. If it's never been changed this will make a dramatic difference.

Jul 18, 2009 | 2005 Cadillac CTS

4 Answers

The car will not start. The battery is in good condition. I have a keyless start and had the starter replaced 3 months ago when it would not start the first time. Now it would not start again with the...


My 2004 CTS started doing the same thing last week (October 24) Took it to the dealer the PCM was shot. It was covered under the factory warranty (130 000km if I remember right) works great now.

Jul 16, 2008 | 2007 Cadillac CTS 3.6L

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