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Posts Tagged: thermostat

P0128 Most Common Causes

P0128 most common causes and fix A Po128 trouble code is generic OBDII trouble code and is defined as: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What does a P0128 mean The two most common causes of a P0128 are bad thermostat or a bad engine coolant temperature sensor. The vast majority of the time, it’s a bad thermostat that opens too quickly. How the ECM sets a P0128 code The ECM knows the engine coolant temperature. After you start the engine, it knows the RPMs and fuel mixtures. … Read More

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