Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello, my name is Bobby. Thank you for the question. These codes are seemingly all unrelated to one another. Most of the time when you get all of these codes together it is due to an issue with the battery or alternator not putting out the right voltage or an electrical short someplace. It may also be a failing PCM. I would start by having the alternator and battery load tested. I would also make sure that the battery connections are clean and tight. If nothing comes up please let me know and we can continue.
No, they will use separate reference voltage supplies. It sounds like you do have a bad ECM.