Originally Posted by FP
Just remove and twist the gas cap on again. It could be as simple as the cap not on right, or it's the car has been sitting all winter. There's a good chance you will not see the error again.
I agree with FP I would remove gas cap and put it back on. My trouble code chart shows PO453 as "Evaporative Emission Control System Pressure Sensor High Input". By the way HDDP posted awhile back all the trouble codes for the Crossfire.