I think it's a false reading and not anything to do with actual overheating. Every time I get the message it's first thing in the morning after only doing a short drive the night before. It went off earlier this week when the temp was in the 30's. Like I said I saw the actual temp of the coolant on my scanguage and it was normal so I wasn't worried about driving it for a few days before going to the dealer which was no help anyway.
2011 IOM 1LT RS. K&N Typhoon CAI; Sequential taillights, SLP faded gill overlays, VMAX CNC ported TB, RX Ported IM, RX breather, 3/8" Black Ice-olator, OEM STB, 4 gauge pack, Alpine amp and sub, convertible spoiler, IOM painted rear diffuser, SS front and rear sways, SS front and rear struts and springs, Street Scene front splitter, IOM hideaway headlight covers, 5% window tint.