Automatic Gearbox 528i se big problem

Hi I have Bmw 528 i SE automatic and I was driving to pick up my wife suddenly TRANSMISSION FAILSAFE PRogr popped up and the gearbox started to drive on one gear I think its emergency program so my friend he is fixing automatic gearboxes tryied to check the faults on the computer and it showed actually nothing that it doesnt see the gearbox computer so he loged in to engine computer and it showed that the EGS is not visible or something like that so what does it mean please help I know that i made a mess with explainig it so give me a questions and i answer thanks

Slainte. My 2003 525i spontaneously went into failsafe mode and stayed in one gear. It ended up being a low/dead battery . That was the only indication that I got that anything was wrong. No battery light came on or any other warning that I noticed. As I was driving to my destination, other things started shutting down, heater, radio, etc.. I got to where I was going, parked and shut the car off. It would not restart, dead battery. No surprise. Had it towed, and it needed a new alternator and battery. No problems since. I don't know why there was no battery light, or other symptoms of a low battery. That was about a year ago, and the car had about 96k and it was only the 2nd battery. Good luck.

alternator was changed maybe 7 months ago and I have put orginal one and battery is very good its not dead or anything everything else is working fine ...just this f.....k...g gearbox