The temperature from the thermometer should be around 200 degrees fahrenheit, normally. You need to compare this reading to one obtained by an infrared thermometer. To do this accurately, you need a scan tool, but a reading is also possible to obtain if your car a has a temperature gauge. If the hose gets hot all of sudden like it should, then the next thing to check is the reading you are getting from the coolant temperature sensor. If the radiator hose just slowly warms up and doesn’t get hot all of a sudden, the cause is the thermostat being stuck open. You have to be careful because it is hot enough that you could be burned. When the thermostat opens, very hot coolant should start to flow and quickly warm the radiator hose up. Generally speaking, the hose should be barely warm until the thermostat opens. How does a mechanic diagnose the P0128 code?ĭiagnostic methods can vary from mechanic to mechanic but the first thing I check is to see how hot the coolant temperature is when coolant starts flowing through the radiator hose connected to the thermostat. Heater is not hot enough due to the coolant temperature in the engine being lowĬar takes too long to warm up, or the temperature gauge does not go up as high as it used to The next cause is a problem with the engine coolant temperature sensor or the wiring associated with the sensor. The most common cause is an engine coolant thermostat that has stuck open or is opening prematurely. The Engine Control Module (ECM) determines this length of time based on ambient temperature. In other words, there is a problem with the engine operating temperature not being reached within a certain amount of time.
COOLANT TEMPERATURE CODE
The P0128 code means that the engine coolant is not getting warm enough, fast enough. Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means
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