Code P0597 Thermostat Heater Control Circuit Open - AutoCodes
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WEBApr 28, 2019 · What are Code P0597 Possible Symptoms? Engine Light ON (or Service Engine Soon Warning Light) Code P0597 Description. The Engine Control Module ( ECM) controls the Pulse Width Modulated (PWM) thermostat. The engine coolant thermostat heater controls coolant flow and regulates the engine operating temperature.
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