* If the above items check out good, replace the thermostat * Verify proper intake air temperature (IAT) sensor operation, replace if necessary. ![]() * Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary. * Verify proper cooling fan operation (check if it's running more than it should). However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code: Possible Solutions: Past experience indicates that the most likely solution is to replace the thermostat. * Faulty intake air temperature (IAT) sensor * Faulty coolant temperature (ECT) sensor ![]() Symptoms: You will likely not notice any drivability problems other than the MIL illumination.Ĭauses: A code P0128 may mean that one or more of the following has happened: 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. The intent of the P0128 code is to indicate a faulty thermostat. 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. P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code.If the above items check out good, replace the thermostat.Verify proper intake air temperature (IAT) sensor operation, replace if.Verify proper engine coolant temperature (ECT) sensor operation, replace.Verify proper cooling fan operation (check if it's running more than it.However here are some suggestions on troubleshooting and repairing a P0128 OBD-II Past experience indicates that the most likely solution is to replace the thermostat. Faulty intake air temperature (IAT) sensor.Faulty coolant temperature (ECT) sensor. ![]() You will likely not notice any drivability problems other than the MILĪ code P0128 may mean that one or more of the following has happened: Takes into account the length of time the vehicle has been running, the intakeĪir temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor In determining the engine did not reach a "normal" temperature, it Required temperature level within a specified amount of time after starting This means that the engine's PCM detected that the engine has not reached the
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