I have a 2001 Chevy Tahoe and the security has been broken into how do

Hi Jerry!

So the 01' Tahoe has something called Passlock. This is an an extra security measure GM put in their cars that prevents fuel from going into the engine and starting the car. Here's a PDF of the 01' Tahoe Manual that talks about this more

Chevrolet-2001-Tahoe

Usually, reprogramming the Passlock system is my go-to. I have a PDF that shows you how to do this. As an FYI, check page 4 first to see what type of system you have, because that will show you what method to do

GM Vehicle Theft Deterrent (VTD) Relearn Procedures

Now if the Key Reprogramming didn't work, use an OBD-II reader to see if there are any error codes that are showing up. Usually they can lead you to what needs to be fixed