that sounds like it's one of the scheduled maintenance messages that are programmed into the em.......like the oil change interval....how long have you owned the car as it seems you've never seen this before?
Finally got my Visa computer in. Had code cem 650b cooling fan signal missing. Found 60 amp fuse blown. Which by the way is hidden in the bottom of engine bay fuse box. Going to get another fuse today. And see if that fixes the problem. I already swapped cooling fans. So the fuse shouldn't blow again. Will update in the next couple of days