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If you manually reset by pressing overtemp thermostat, then check your operating thermostat.. maybe over heating.. if so replace thermostat.. if pilot cuts out completely prematurely without reaching set temp then replace overtemp cut out thermostat as it is faulty. Cheers
your thermostat is designed to open at a specific temp, for example a 195 thermostat is supposed to start opening at 195 but will not fully open until it reached about 210. Your ECM has determined that your thermostat is not 'closed', but is hung open, not allowing the engine to reach a temp that the computer is set to see. So the thermostat is either malfunctioning, or your temperature sender unit is reporting the wrong thing to the ECU. Probably a good time to replace the thermostat, if the condition persists, replace the sender unit-both items together will cost less than $30 total.
more than likely the thermostat has stuck open. Or opening to soon not allowing the car to reach normal operating temperature. I would start by replacing the thermostat. Clearing the code and running a drive cycle and see if the code comes back. if the code does not return problem solved. if it does return replace the coolant temp sensor.
try replacing thermostat, or possibly temp. sensor (should be near thermostat- threaded into block- prob 1 wire). most likely failing thermostat! make sure you get the correct replacement for it! some have different temp. ranges. 'opening' temp. should be stamped on rim of thermostat. good luck!
check to differential setting in the thermostat and are you saying the temp in the room and the set temp is being read from the thermostat or is there another thermometer in the room your looking at
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