C language is preferred a lot for Mechatronics Engineers. But as per the recent year surveys, Python is the most demanding one as it is very handy and it uses lots of in built functions which will help your program look short too with same kind of output. Java is another language that you can focus on.

Refer to the site below for more detailed information about the same....

https://www.careers360.com/courses/mechatronics-engineering-course

Best wishes. Thank you.