Saturn Repair Problems? 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.Any time you replace the BCM and the ECM they have to be programmed for the car they are being installed in, you can not use a used unit from another vehicle as the programming will not be correct. I would start first with making sure the ECM and the BCM are programmed for your Ion.
The only way to know is to have them checked and this usually requires the dealer. The BCM can keep it from cranking . Are you able to scan the systems and see if there are any fault code setting?
Sure sound to me like you may have a programming concern with the computer or the BCM or both.
Open the post back up for you now.