In your engine compartment fuse box check fuses F1,F9 and F28, make sure they look ok and seated properly, also check Relay R2, wich should be your comm enable, try switching it with another relay that's the same number like R5.
2009 Pontiac G8 GT 6.0 L 6 speed Automatic, Magnetic Gray Metallic, Ls 9 Cam, RotoFab CAI, UPR Oil Catch Can, 3.45 Differential, Solo HFC, Solo 3" Cyclone Cat back, changed DIC to White and Radio to Red and White combo, 202, 000 miles(325,000 km).
There's a rubber section around that bearing that starts to wear out as well as the bearing itself failing. If you you- tube carrier bearing removal on Pontiac G8 there's lots of videos on how to replace it.