Not sure if this is the best place to post, but has anyone else experienced issues with a loud buzzing audible to the person you are calling when your cell phone is using the bluetooth link? I have done significant testing and it appears to be a shielding problem. If you isolate your phone well, it will not feedback buzz. This appears to be a problem mostly for those using the GSM network. Using a separate bluetooth earbud is fine, it's only using the system in the '09 Cobalt, where the issue occurs. Anyone know of a fix???

 

BUMP!

I am having the same problem. Get a buzz if I put my iphone on the passenger seat, cup holder, or door pocket. Only place it works is on my lap.

 

I got my buzz issue fixed at the dealership. There is a new TSB to replace the mic and bezel. The buzz only happens with GSM phones running on older Edge networks. 3G networks have no problems.

 

You have a link to that tsb or part #'s? I ordered the mic by itself and in the original tsb I read it made no mention of a new bezel but after getting the mic it was obvious that it did.