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, Snow Performance stage 2 100% meth, NGK7IX, 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. (640whp 615wtq)