i have gs300 2003 .. the problem with the transmission. When the transmission is in the M position. A flashing letter M appears in the screen It is shown in the 3rd gear. And I can't control from the steering wheel

Also When placed at P, it does not show in the counter that it is at P.

 

My car did this when it had a bad transmission solenoid. The flashing M indicates that there is a problem in the transmission that prohibits enabling Manual mode.

Either get your hands on a comprehensive OBD-II reader that can read transmission codes or bring it to a transmission shop that has such a reader to see what's up.

There is also no need to use gigantic font.

 

and what did you do?

 

I had the bad solenoid replaced.

 

this solenoid?

 

In my case it was the Shift Solenoid Valve S3. Yours may be different, or it may not be that at all. Only a transmission shop (or proper scanner) will be able to tell you.