Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.In most cases if it will not crank the computer will set and store a fault code and or code as well s the body control module for the locks and lift gate. Can you start with scanning the system again and see if there are any new codes setting and post back with the results and we can work from there.
The code U0140 can be set by any of the following.
Its at the ignition switch on the column opposite of the the key and tumbler.
Here is what GM offers. See the link below. If you have enver done this type of repair before you may want to consider having it professionally done because you could mess of the theft system and end up worse off.https://dl.dropboxusercontent.com/u/104923897/Ign%20Jan%2013.pdf
They will need the truck, the information from the old one will need to be downloaded and reloaded into the new one. In most cases they like to have the truck there .
They can usually retrieve the information from it and if not they can still come up with it. You really do not know if its actually fried at this point.