When the engine is cold, motor oil is quite thicker. If the engine takes time to warm up, the engine oil will not properly to the vital parts of the engine. When an engine doesn’t get warm enough, it will get bad fuel mileage and the engine oil may start to get sludged up with the deposits in the engine. What Happens If Engine Doesn’t Get Warm Enough Quickly? Modern car engines work at a certain range of temperatures ranging between 192-degree Fahrenheit and 212-degree Fahrenheit. If it doesn’t reach that temperature in the expected time, it sets P0128. Based on those variables, PCM calculates how long the engine should take to reach operating temperature. The engine power control module (PCM) throws the P0128 code because it has engine coolant temperature data, intake air temperature data, and engine RPM data. It can also mean that the engine has failed to reach a certain temperature within a specific amount of time. If the P0128 code sets, it doesn’t always mean that the coolant thermostat is bad. The exact meaning of the P0128 trouble code in vehicles is that the ‘ Coolant temperature is below the regulating temperature of thermostat’. The engine control module sets the P0128 code when the engine isn’t warming up as quickly as expected due to the low temperature of the coolant. Faulty Engine Coolant Temperature Sensor or Wiring Low Engine Coolant Level and Poor Coolant Quality Coolant Thermostat Is Stuck Open or Leaking What Happens If Engine Doesn’t Get Warm Enough Quickly?.
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