I have a po128 trouble code in my car it says coolant thermostat, coolant temperature below thermostat regulating temperature, what is the fix for this.2002olds intrigue 3.5l

P0128:
P0128 OBD-II Trouble Code
Technical DescriptionCoolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

What does that mean?This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

CausesA code P0128 may mean that one or more of the following has happened:

Low engine coolant level .
Leaking or stuck open thermostat .
Faulty cooling fan (running too much) .
Faulty coolant temperature (ECT) sensor.
Faulty intake air temperature (IAT) sensor .Here's a link on replacing your thermostat.

P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature

Trouble Code: P0128

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Possible Causes:


Insufficient warm-up time.Low engine coolant level.Leaking or stuck open thermostat.Inoperative engine coolant temperature sensor.Inoperative cylinder head temperature sensor.Here are the reasons.

P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0463 Fuel Level Sensor Circuit High input

obd2 code scanner

Well, I can't give you any specific information regarding your vehicle because you forgot to mention what kind of vehicle you have. (This is kinda important if you really want some help figuring out what is wrong with your car)

The "Generic OBD" of code P0128 is "Coolant Temperature Below Thermostat Regulating Temperature"

The most likely cause is a stuck-open thermostat, however, I have also seen defective Engine Coolant Temperature (ECT) sensors also cause this code.

DTC P0128: Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature
Do you have any issues with heat in the vehicle? If so the thermostat may need replaced If not the engine coolant temperature sensor is most likely reading incorrectly due to a bad sensor or connection to the sensor.

P0128 - Coolant Thermostat (coolant Temp Below Thermostat Regulating Temperature). First check the coolant level,if its low then refill the coolant.If the coolant is checked full then get the thermostat replaced.-----------That's it.

CODE PO128 - ECT SENSOR BELOW THERMOSTAT REGULATING TEMPERATURE CONDITIONS. CHECK THE OPERATION OF THE THERMOSTAT IT MAY BE STUCK OPEN.ECT SENSOR HAS FAILED.CHECK FOR LOW COOLANT LEVEL OR INCORRECT COOLANT MIXTURE.- ECT SENSOR IS THE ENGINE COOLANT TEMPERATURE SENSOR.

The generic code stands for Coolant Thermostat (the Coolant Temperature is below the thermostat regulating temperature) Need to replace thermostat according to that it is opening too soon.