Trans Failsafe Prog + GT1 screenshots - HELP

[iturregui]

Need help from you guys diagnosing this error. Came up on Sunday during hard acceleration in Sport mode. The transmission got into limp mode, stuck in what I believe was 4th gear. Drove with it for about 50 miles. Stopped, turned it off, then back on and the problem disappeared.

Later on, close to my home, I tested the acceleration in S mode again and the failsafe light re-appeared. This time however the tranny was shifting normally through all the gears.

So got home and connected the GT1 and here are the screenshots.

It's an X5 2006 4.4. Almost 53,000Kms. There are not any issues with the tranny (hard shifting, slipping, noises, leaks, etc)

Stored faults:


Cluster:


EGS:


EGS Details:


DSC:


DSC Details 1:


DSC Details 2:

I blacked out the speed at which the error occurred because I don't want this thread to become hijacked by another topic.

I have been reading here a lot about this Trans Failsafe Prog and many times it's been a Battery/Alternator/VoltageRegulator problem.

I need to test the alternator voltage during hard acceleration to see if the voltage is kept steady. Yesterday I did the BC unlock trick and (idling) saw the battery/alternator voltage showed 14.1V but sometimes it came down to 13.7V. I did not see anything over that, like the 16V showed in the EGS fault.

So I need some input from you guys as to what would be the next thing to test. I really don't believe that there are issues with the transmission/transfer, but I'm not a bimmer expert either.

Thanks in advance for your help