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I wouldnt read too far into that code because it means exactly what it is saying....P0117 Engine Coolant Temperature Circuit - Low Input, your coolant temp sensor sends a signal to your gauge and the computer that tells them what the actually coolant temp is. It just simply went bad, There no way it'll be the thermostat, If the thermostat went bad you would either have really high temps or normal temps but would take slightly longer than normal to reach normal operating temps.
So your gauge being pinned at below 100 and the overheat light being lit and the P0117 all point to the coolant temp sensor. They go out eventually and they are probably easy to replace yourself depending where on the block it is screwed into.
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