I have a Tahoe 2015 that the trans died. So i bought another 6L80e from a 2010ish.
Swapped it, I have no communication u0101 and u0100 but the trans is shifting assuming always a 34.9% throttle.
Now I see that it does not sees the TPS, it is always at 34.9%. So I think there is no communication between ECU and TCM (also the u101 is telling me that)
Can I write entire an 24270599 OS over the 24256125 OS on the TCM????
The Tahoe is an e92 GM SIDI with an original 24270599 OS with serial DV0598.....
The new (2010ish) 6L80e is an 24256125 OS with serial DV6124.....
I already tested changing the entire valve body to the original transmission one. But it was worst. It was stuck in 3rd gear (I think) always.