There's a dealer bulletin on this already. But no fix as of yet. I have it too.
I am trying to build a fix for it now as chevy seems not to care.
Rig: 16' Colly LT 4x4 2.8D, short bed, G80, Bose, etc
Built list: Bak revolver x2, premium Line-X, rigid b/up lights cut & mounted in bumper, kn insert air fltr, zroadz fog plate w/rigid spots & floods, d-max tuner, matte blk badges and custom diesel badges
To/do: N-Fab runners, bilstien 5100 RHA 2" lift with rear 1" gm lift blks, dry cold air intake, puddle leds, 275/65-18 TA ko2 on helo 904s w/ 0 offset, Anzo headlights and tails
Sponsors: Virginia Line-X (Ant), Alt Mana.