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I'm sure this post was made long ago and you have already found an answer. So i'm going to answer for others who may have the same issue. I have a 99 Cadillac deville and went through this problem for 5 months. Sometimes it would start after 3 minutes, and other times I was stranded for up to 6 hours of waiting and trying to start, again and again. There are numerous posts about the passkey 3 system etc etc. I found out all I needed was a new igniton switch which yes includes having a new key cut (cost me $160 total for the entire job). Had that done 16 months ago and not one time have I had this issue again. The way it was explained to me is when you adjust your steering wheel over and over, it can ultimately smash and eventually cut into the ignition wire. This ultimately will lead to the secuity message where the car thinks someone is trying to steal your car. I saw the old igniton wires and yes they were diffinetly smashed in some places and cut in 2 areas. Anyways this is something you may want to look into before reading all of the technical crap and the $$$$$ that goes with it.

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11y ago

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