Hi guys.
I have an AUDI A6 C5 2.8 quattro automatic.
I have a problem that only the first and second gears work, the third fourth and fifth slip, the computer shows that he switched to third but slips, it happened as I went with the car up a big hill, safe mode started, I turned off the car and started everything looked okay, but it slips ..

I apologize in bad English, I'm from Bosnia ...