Ive read similar posts but have come up empty handed. My car ran fine last week and then when leaving work it seemed like the battery was dead. I got a jump from a friend and it worked. Later that night it did it again and this time i saw there was corrosion on my negative battery terminal. I took a brush and cleaned it real quick and she fired right up. I tested the multimeter on the battery and it was getting a charge from the alternator so i ruled that out. It died all of a sudden after driving it for three days in my driveway (luckily) this time it wouldn't even try to crank. I figured the battery was too far gone, so I replaced. Still nothing. Checked the crank relay and replaced it, nothing. It had a new ignition installed 3/4 years ago for the recall. I went to a junk yard and picked up a ecm since I lost communication with my computer via my scan tool. Ive checked everything. I can get it to turn over and start and drive by bypassing the relay. Its not great but it works. I need to find the problem though. Any one else who had this problem how did you fix it?