We got vehicle in July and did have one check engine light come on during -30c cold snap. Light did go out after two days, went to dealer and they said not to worry - they did not hook up and check codes.

Large engine warning light came on this time as described, when i pulled over car died and would not start. Power to electrics went during call to BMW Assist. Power did come back later when I locked it and folded mirrors in.

I had been drving car earlier in day without an issue, then home for 5 minutes and out again.

Car at dealership now and I hope the diagnosis and repairs come quickly (or at least a loaner as we are a one car family).

I will update once I have more information.

Thanks everyone!