Please help. My car threw out a transm failsafe code and disabled gears 4-6. but now it wont even go into 1st or reverse at all. All of this happened today. I scanned the the error codes and got a P1887 error code back from the OBDII scanner. Anyone els experiance this?

maybe this thread may help.
https://5series.net/forums/topic/866...sion-fail-safe

does the problem persist after restarting?
how old is your battery?

Thanks for the link. Seems very simar to my problem. Yes it presists after restarting. And my battery is brand new and oem. Installed and registered by the dealer.

After numerous alternator tests passed I decided to get it rebuilt anyway and the shop was amazed when they took it apart. The brushes were completely gone and so was the voltage regulator. Yet it still produced just enough power to fool the computer into thinking it was working fine. I had a feeling it was the alternator all along. I never liked how it only produced 13.79V at idle. Now it produces 14.14v at idle with the rebuilt alternator and the car runs just fine.

good to hear