On my Cobalt whenever I use Onstar humming noises come out of the speakers... Its really bad when I go to accelerate while using onstar and the humming speeds up and slows down with how much I push the gas pedal down. Does anyone have ANY ideas on what I can do to get rid of that humming noise?!? I dont use Onstar that much at all but when I do its REALLY annoying! ANY help would greatly be appreciated!

 

I get it too. I thought it was like an alternator whine. I don't use it oeten either so it didn't bother me.

 

I get the same thing when I am using the AM radio. Every GM car I have owned has done this with the AM. I have never found a solution to the problem.