transmission control unit on 2004 Audi A4

What is the cost to change the transmission control unit?

Asked by for the 2004 Audi A4
They range from about $600. BUT, be sure that it is not your trans because the CVT transmissions on these cars go out a lot and then they stick in 1 gear. I just had to install one on a 2005 A4 with a 4 cylinder ( non-quatro)