I tried to load a tune and it won’t.
For this ‘car’ I have 13 saved tunes.
The one I’m trying to load is 11 in the list.
Is there a ‘limit’ on the # of tunes for a single car?
Thanks
Far as I know it only applies to total tunes for all cars, not the single car, many tunes as you want for the one car 
When it won’t load the tune, could you include any error message your seeing or sequence of what the menu is doing?
There is no error message
nor is there anything at all taking place.
It will not load.
I also tried loading the 12th and 13th tune in the list I have saved for that car and neither of them will load.
The first 10 in the list I have no issue with and will load.
you can have as many tunes for the same car! I went up to 200 to test for you. The only limitation here is an overall amount of tunes you have - 1000 is your maximum!