Had you had your M serviced just before it happened? I had this error just after having mine services - actually in the parking lot of the dealer. Then a similar thing just after having my Z4 serviced and to my wife just after her 5er was serviced. I suspect that they may put a drain on the battery when they are in the shop. If the alternator of battery is weak that it the last straw. If not all it needs is a good run on the highway.
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07 X5 E70 4.8i
04 Z4 E85 3.0
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