![]() If code P0128 is the only error present, your mechanic may check for an open thermostat since thermostat malfunctions usually cause DTC P0128. First, they will scan your vehicle with an OBD-II scanne r for error codes.Ģ. Here’s how your mechanic will diagnose a P0128:ġ. Cold weather conditions that prevent the engine from reaching it s normal operating temperature.A faulty intake air temperature sensor ( IAT sensor ).A defective engine coolant temp senso r ( ECT sensor ).The coolant is a part of the car’s liquid cooling system, in addition to a water pump, radiator, cooling fan, thermostat, and hoses like the upper radiator hose.It removes excess heat and protects important moving components like the water pump, cylinder, head gasket, etc. A coolant is an antifreeze solution that regulates the engine’s operating temperature to prevent overheating.So a sticking or open thermostat keeps circulating the coolant even when it’s not needed, causing the engine to operate below its normal operating temperature.When the engine is warm enough, or the temperature gauge reaches the required operating temp, the thermostat lets the coolant flow through the radiator to maintain the engine temperature.You can find it inside the thermostat housing between the radiator and the engine. A thermostat regulates the engine temperature. ![]() Anything from irregular coolant thermostat temp (from faulty sensor readings) to low engine coolant levels can trigger a DTC P0128 code. ![]()
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