With my 2008 Phaeton 3.0 V6 TDI, 240 hp the following is displayed. Error code P1857 load signal. Every now and then it has speed fluctuations, shortly after starting and also on the highway, but rather very rarely. Recently the transmission oil was changed, since then it also switches hard between the first in the second and the third in the second. Does this have to do with each other or is the error coder P1857 something independent? For a good tip I am very grateful.