Low coolant levels can also trigger code P0128. If the sensor fails, it can send inaccurate signals to the ECM, causing it to think that the engine is not reaching its optimal operating temperature. The coolant temperature sensor is responsible for sending a signal to the ECM that indicates the engine’s temperature. If the thermostat becomes stuck open, it can prevent the engine from reaching its optimal operating temperature.Īnother possible cause of code P0128 is a malfunctioning coolant temperature sensor. A thermostat is a temperature-regulating valve that opens and closes to allow coolant to flow through the engine. One of the most common causes of code P0128 is a faulty thermostat. Check it before you go with thermostat fixing. Note: The cause of this error may pop out from a faulty coolant temperature sensor, air intake temperature sensor or stuck cooling fan. In this article, we’ll explore the potential causes and solutions for OBD-II code P0128. This code can be triggered by a variety of issues, ranging from a faulty thermostat to a malfunctioning coolant temperature sensor. OBD-II code P0128 is a common diagnostic trouble code that appears when your vehicle’s engine control module (ECM) detects that the engine is not reaching its optimal operating temperature within a specified time period. P0128 Code – Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
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