Unfortunately, these units have a high failure rate. The driver is equipped with a feedback circuit that is pulled-up to. The ECM controls the engine coolant thermostat heater by grounding the control circuit with a solid state device called a driver. The PCM monitors coolant temperature at the sensor and use a pulse width modulated power to regulate how much heat to apply to the wax pellet in the thermostat to speed up opening time. The engine coolant thermostat heater controls coolant flow and regulates the engine operating temperature. The thermostat begins to open at 221☏ and is fully open at 248☏. The thermostat, housing, heater and sensor are a single unit. GM uses a heated thermostat assembly as a single unit. So car makers also incorporate a heating element in the thermostat to speed up thermostat opening to provide optimum cooling. P0 codes are displayed as P0XXX, with the third numeral in the code sequence signifying. But that can also impair engine cooling once the driver takes off from idle. P0128 is an extension of OBD-II code P0 which indicates a problem with your car’s coolant thermostat. Some rely on a radiator shutter mechanism to block airflow across the radiator to reduce heat loss on the engine coolant. ![]() Car makers use various methods to improve cabin heating. These smaller engines often run hotter when the turbo is in operation, but can fail to output enough heat to warm the passenger cabin when the vehicle is at idle in cold conditions. Why use a heated thermostat?Ĭar makers routinely install smaller turbocharged engines to lower vehicle weight and improve gas mileage and emissions. A P0597 Engine Coolant Thermostat Heater Control Circuit Trouble code indicates a problem with the thermostat, heater, wiring harness, electrical connector or the thermostat housing itself. When the heater circuit fails, most of the time it will create an open circuit. When the engine management module detects this condition, it will set a code. Late model engine use a heated thermostat. If the heater circuit is no longer able to control wax, the lack of change can be detected by the coolant temperature sensors on the block, head and radiator. Repair Topics > Cooling System Service > P0597 Engine Coolant Thermostat Heater Control Circuit P0597 Engine Coolant Thermostat Heater Control Circuit Fix P0597 trouble code What is a P0597 trouble code?
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