W211 keeps getting into limp mode

[MsvMercedes]

Hi everyone.
My w211 e320 petrol keeps entering into limp mode even after changing 3 complete transmissions.we changed several tcms several transmission selector and several valve boards. After changing all these it shifts upto 5 then automatically down shifts and now limp if you stop the vehicle and shift to park and back to drive it starts shifting normally for a few minutes. On a star c5 diagnosis it keeps giving TCM fault current and stored ,gear ratio impassible and gear comparison negative even after changing several components. What else can we try? Please help

 

[mersum1es]

Were all swapped TCUs coded right to car (gear ratio)?. Harness dry (no oil)? Whats wheel speed (usually rear) sensor reading compared to others when fault code triggers?

 

[MsvMercedes]

Were all swapped TCUs coded right to car (gear ratio)?. Harness dry (no oil)? Whats wheel speed (usually rear) sensor reading compared to others when fault code triggers?

Hi
We matched the part numbers with the original one hoping to have matched calibration. How ever we haven't checked the wheel speed readings yet.