It went away for awhile, but its back again. No sound upon loading, so you have to restart the game.
Yep, its back.
Happened to me yesterday while I was btching about the game. Did the first race of community championship, switch off my console, went back and then, no sound…
I got this just once - game loaded into free roam and I had LaFerrari. It had no sound at all, but then the engine sound kicked in several seconds later, lol!