transmission does not shift into overdrive

i just had a simuliar problem with my toyota highlander, I flushed the transmission fluid and change the filter if your car has one. THen I put a a lucas oil conditioner and Im good

I have the same. Overdrive trouble could be solenoid left side trans above park/neutral swicth, Trany temp switch I have not located, coolant temp I have not checked and speed sensor that I changed. CC don't work