Another X5 3.0 Trans issue

[madman23]

I have officially run out of ideas. My 2003 X5 3.0i with a GM trans is throwing a code. 2nd gear incorrect. If I completely bypass 2nd (throw it in sport and shift from 1st to 3rd, it works fine. In normal drive it'll rev until you let off then shift, but it'll eventually shift from first and bang into second, then it goes into trans limp mode and throws the code. Sometimes it will do it from second to third. I have changed the solenoids and the tcm and I am fresh out of ideas other than the trans itself.

A little back story about when it started. I did what I was told not to do. It was an awesome truck and helped me move twice. It has 186xxx on it and I felt like being good to it and changing all of the fluids.... including the trans fluid and filter. And thats when it all started.

Any thoughts or ideas? I really don't want to replace the trans but if thats the only option...

Thanks in advance.