Hmmm, at this point, there is entirely too much guessing. Qsilver hit the nail on the head with the battery, but at this point voltage doesn't seem to be your problem. This may suck, but you are going to either have to take it to the stealer to have the code read or a indy shop who has GT-1 to get the code. No time for guessing anymore. Mine came on this morning but also read "4x4 Inactive" on the cluster. After a restart, the light went away. Things like this occur because of voltage. As of now, my voltage regulator is on its way out. But for you, the story is different.

TwinsPoppa had the same problem a few months ago, luckily he has a GT-1 and it spelled out SAS. So he DIY'd it himself. You got to spend a few bucks to get the fault back, but atleast you can stop guessing.

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2011 E70 50i M Sport