no engine sound in porshe cup car

Anyone else having this issue. Doesn't matter which of the cup series i try, there is no engine sound. I can hear the rain, or gravel if i go of, some some portion is working,but not the engine
Other cars like gt3, gt4, open wheel, stockcar are fine

 

Try validating the game files through steam.
I raced the combo on the Nordschleife 24 hour on saturday and i didnt experience this issue.