Got the same x5 4X4, DSC warning a couple times over past two weeks. On one occasion the computer cut power to the engine and the engine malfunction light came on too.

Dealer today said a BMW bulletin exists about this. A faulty cable harness is the problem. A replacement is the solution. He's overnighting the part for immediate install.

Will post update after fix.

2009 BMW x5 4.8i, 55K miles.