u/Glum_Vanilla8062

I have a 2007 cls550 with 120k kms and I got a check engine light with the code P0717. When driving sometimes the traction turns off and the light pops up, as well as the car being stuck in 2-3rd gear (limp). When the car is turned off and back on it drives normally once again. I did recently change the transmission fluid and it stopped for a while and now the problem came back. What is the problem?