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There is a TSB out for poor radio reception on the stock setup, the antenna cable can come unplugged. To fix this, go on your passenger side, remove the scuff plate from the floor board >see 1st pic<, once you have removed it (just pulls off comes out as one piece, be careful so you don't break/loose the metal clips, its hard to do but it sometimes happens) Now look right by the door where the floor starts to curve up, you should fine a black 6 gauge wire, it should be plugged in to a connector >see 2nd pic<, yours is most likely unplugged or loose, Gm said just to tape the connection up using duct tape or electrical tape.
Thant should be it, hope this helps!
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