Originally Posted by GM Customer Svc
Just checking in to see if the issue has been taken care of. Please keep us posted.
Caron, GM Customer Service
I first suspected the alternator, but the static AM problem occurs when the engine is not started. I took a good portable AM radio and placed in on the passenger seat. I tuned to a good AM station (if there is such a thing) and that radio was perfect until the ignition switch was turned on. It knocked that signal identical to the installed radio, There is no similar effect to FM or XM. I have an appointment at the dealership and will post that outcome. Tghanks