Had the same issue. Only happens once in a while when its real cold out. I just chuck it up as my car dont like the cold. Dealer never could get it to do it so they are clueless. I replaced the sensor and pig tail and still get the code. I looked are freeze frame data when the code sets and nothing is outta the norm. Kinda odd. Go GM!!!
MODS: Spec.CAI, OBX long tubes, No CAT's, Pacesetter header Back,Magnaflow resonated X-Pipe, Hurst Shifter, MACE 1/2 Intake spacer, Ported IM, Relocated IAT, Trifecta tune, SS front bumper, and Eibach springs.