Boosted11

I've got a humming noise coming from all the speakers as soon as I open the door and even after I start the car but after I start the car it will rev with the rpm...also sometimes when I get on it a check electrical system error comes up on the dash even tho the voltage doesn't spike or drop...this is on a 2011 ls3 lt2 package car btw

Gesualdo3

I have the same issue with my C6.....where you ever able to diagnose the problem?