I am posting this for general knowledge since maybe a fix when I had the warning but could not find any information. I started to get warnings about advancetrac a few times and once or twice brake service warning a few weeks ago. My battery seemed like it was starting to go because when I started vehicle it was really slow to turn over especially when cold. Electrical meter read 12.6+ so I was confused and did not have to to take somewhere to test. I swapped out with one of my f250 diesel batteries and it started normal. Ran out the same day and bought a new batter at sams. BTW motorcraft batteries suck. This is my second one in 5 yrs. First was warranty but this one just passed warranty a few months. I now do not get the advancetrac or brake service warnings anymore and it has been a few weeks.