Answer 1

Hey there!

This is quite a good question and so I decided to also take a deeper look for good answers.

The shortest answer I have found is "Assembler, C and C++".

So far so good, but there is more to this topic than this and so I stumbled over the following article.

https://medium.com/@viktorschepik/how-to-be-an-automobile-software-engineer-part-1-7729a780d89b

To be honest, this article is quite big und it consits of at least 3 parts. every part ist more interesting that the other and will, at least i think so, give you a really good overview of how it is to work as a programmer in the car industry.

Reading this will be a really good use of your time and will answer more than only your entry question.

but maybe afterwards there will be more questions than before :)

have fun