Problem: the in game passenger camera sounds like 3rd person

yesterday me and my friend were having a competition of the best sounding car. And I noticed that when I went into his vehicle as passenger, the sound was the same as if I was in 3rd person. In my oppinoin it should sound the same as the driver and it did on his side when he went into my car. If i go into driver cam on his car the interiour sound is there. I dont know what the problem is, whats causing it nor how to fix it. thanks for help!