I have a 2008 chevy malibu 2.4 . I have no start condition with dash saying powersteering, traction control,service esc, low fuel(halftank in there). I have changed fuse box and then new pre programmed ECU and still not starting. I have tested starter, battery and connections to it,grounds, relays, fuses, fuel pump relay and fuel pump, my friend used his scanner and can system is working so is bcm. His snap on scanner had a u2105 code but my autel has u0100 coming up.i also tested all of the connectors for shorts cleaned them and put dielectric grease on them. I am so stumped with why the car isnt starting, the only thing I'm thinking now is the igntion switch but my mechanic buddy doesnt think it's that. I've been working on it for 2 weeks now and dont know what to do from here. I would appreciate your any input or suggestions. Thanks