Hello, maybe here I can find hep.
the problem appeared after the repair of the engine. The gearbox got into emergency mode and the speeds were not displayed on the screen (P R N D). Next, they replaced the TCU board, which is on mechatronics and registered using a computer. I thought everything was fine, but in the morning I started it and tried it in manual mode, everything works. After a while the manual mode stopped working. Always in the morning, the manual mode works, and a little (according to my observations) later, when the gearbox warms up, manual mode stops working. But it stops strange, it doesn’t switch speeds up, but down if you pull the lever towards the minus, it shows the speed either 3 or 2 which at that moment. If I turn on the manual mode from the place, then it turns on 1 but does not switch up further. All this after some time after the start of the movement. In the morning on a cold one, it works both up and down. I also noticed a problem, when you put it in R mode, the diagnostic connection with the box is lost. What can you advise where to start? Thank you
PS. at the time of the problem, I changed the oil about 7000 km ago
Auto 2006 year BMW E83 3.0 diesel gearbox ZF6HP26