Join Date: May 2010
Location: Henderson, NV
2012 Genesis V-6 w/Premium and Tech. Packages (Sold)
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Since the light is a single signal for hundreds of different problems, I wouldn't advise anybody on trying to figure out what the problem was without an OBD code scanner. Many auto parts stores, such as Autozone, will read your codes for free and tell you the circuit that is tripping. FYI - gas cap issues throw an emissions code, where as thermostat failures are generally entirely different codes.
For the OP, what did the warranty paperwork say when you picked the car up? Sounds like if it is indeed the same exact CEL code being thrown, they most likely just reset the PCM and let you drive off. Make sure it doesn't happen again.