It's possible to play your own music in Euro Truck Simulator 2 by putting music files in your music folder. I've done this, and the music does show up in the in-game music list, but when I play the music it doesn't do anything. I'm trying to play MP3 files, which according to the readme file and online resources is supported by the game.
What do I need to do to get my music to play in-game?
Best Answer
In order to play music in-game your computer will need the proper codecs. Without them the game won't be able to play MP3 files (or other types of music). The K-Lite Codec Pack contains various music codecs, and can be downloaded here. You'll only need the Basic version in order to get MP3 files to work.