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2011 CTS4 3.0l automatic
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I recently acquired a 2006 2.8l that will security lock the key in the ignition and not crank. I can jump it with the purple starter wire trick in the fuse box in the engine compartment. After doing that it will start and run over and over until let sit for a couple hours and then it locks up again.
 

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Hi, I'm afraid it's your ECM. My 2006 3.6 did exactly the same thing and one of these answer services (pro cadillac mechanic answered) said it was 99% certain it was the ECM. I put a reconditioned one on it from a company in south Florida called All Computer Resources Inc. It's easy to change out and if you follow the instructions it should work fine. That took care of the problem. There are a lot of companies who sell those ecms. Mine cost about $300 late last year.
 
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