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 LSA supercharger, 2.5 pulley, ZL1 fuel pump, Fast 85# injectors, VRPD2 cam, custom intake, Nitrous Outlet plate kit (75 shot) custom standalone fuel system for nitrous (116oct) OBX longtubes, 2.5 custom exhaust, BMR Springs, sways, endlinks, bushings, tailing arm, toe links, Brake master drilled rotors, Monster 6 puck clutch w/ lightweight flywheel, Hurst Shifter with custom stick, AEM AFR gauge, and window tint. (708whp 756wtq)