Torque converter failing?

[BladeX5]

Hi all,

Sorry for bothering you just in my first post but I'd like some guidance. I've been reading tons of info in this site mainly and have had the chance to solve several issues with my recently bought X5 (about a month ago). However my main issue is related to my auto transmission ZF, specifically the torque converter as was I was told by the first mechanic who checked it. He suggested a fluid change, 6L of ZF fluid were put in it to see if I could get rid of a shredding noise while changing from 1st to 2nd gear coming from the front of the trans, I believe from where the TC goes. Also, the car will stick on 2nd gear after driving over 40 kms or so, no matter how gentle I drive it. When I have driven the car a lot the gear changes are not as smooth as when it's cold or not driven that much.

I'm so in love with this car that I can't think on letting it go that fast and since I bought it relatively cheap knowing the trans could need to be rebuilt then I still want to give it a try. It's just over a month with it and I have spent more than $1.200 to fix other issues and do the AT fluid change with oem filter and gasket.

My car doesn't rev up and down anytime, it just sounds "uggly" when it goes from 1st to 2nd gear I haven't heard it in any other gear change) and sometimes it jerks in a hard stop coming from 2nd to 1st.

I changed the battery about 3 days ago. Resetted the TCU, changed fluid with oem, including filter and gasket.

When the issue happens it reports an error (scanned with bmw software scanner on a PC) and it says in yellow "excessive torque converter slippage".

But I can't feel any slippage.

What's happenning?! This is driving me crazy and I'm starting to love/hate my X.