Weird transmission behavior
I have a 530d with the m57 from 2004 and yesterday in the highway the gearbox has some weird behavior with a sudden downshift on D/S mode unnecessary and in manual mode it shifted from 4 to 3rd at more than 120kp/h resulting in more than 4937rpm for a second.
No error on board and got home without any problems but I'm worried the Trans might be dying.
It's not the first time the Trans does something strange. A few months back the car went into limp mode when it shifted from 6 to 5 on highway because it looked like the trans had difficulty shifting and gave out a trans error (Red icon) which went out by removing the key and starting again the car.
I've never seen that error again and in the ecu which I used an OBDLink CX to read it and there's no error from the gearbox.
Here is the link to the latest error code read from the ecu using the bimmerlink app https://share.tomasps.com/u/ylgY0r.jpg
Thanks for your time reading this :)