![]() it came back on again after a couple of drives. so i bought and installed the new sensor. they stated that if the thermostat was new, it could be the sensor that failed. A couple of drives later, the check engine light came on again, so i took it back to auto zone and they pulled the same code. i bought a new thermostat from them and replaced the old one. They stated that this generally meant that the thermostat had failed and was stuck open, thereby not allowing the coolant to reach the correct temperature. i took it to auto zone, and they pulled the code P0128 COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTATREGULATING TEMPERATURE). it started right after the new year, with the check engine light coming on. I am also having an issue with this on my '01 Sportage. The appointment at Sunbury Motors Kia is in exactly one week from today. Her Sportage is still covered under the new car warranty, and the Service Manager at the dealership thinks it is a thermostat warranty repair, although he hasn't seen the car yet. The readily available DTC service procedures came in handy for both myself and the dealer, in that we both knew what to expect at the time of the repair. I see now this information is available on a subscription basis. I had previously downloaded repair procedures on other DTCs stored in her PCM when the check engine light came on, without charge, from the Kia Motors website. What is needed is the complete diagnostic repair procedure for P0128. It could also be a problem with a connector, either at the sensor or at the PCM. It seems the coolant temperature sensor that provides the input to the vehicle's Powertrain Control Module (PCM, or on-board computer) is responding in an inappropriate manner. This vehicle doesn't appear to be suffering from 'coolant temperature below thermostat regulating temperature', i.e., a stuck-open thermostat. Yesterday, on a highway ride, she turned her heater OFF (which, if anything, makes the engine run slightly warmer- less heat exchanger capacity with the heater off on most vehicles) and the check engine light came back on with the code P0128 stored on her car's PCM. I have erased P0128 a couple of times from her vehicle's on-board computer, yet it returns. Colder weather would provide a better test for the heater, and thus, the coolant temperature. It is starting to cool off here in Pennsylvania yet she indicates heater output is fine on the cool mornings. The dashboard temperature gauge indicates normal operating temperature. The description is, "coolant thermostat (coolant temperature below thermostat regulating temperature)". My girlfriend's 2001 Kia Sportage EX 4X4, at 40000 miles, has the check engine light coming on and when I read the diagnostic trouble code with the scan tool, the display says, 'P0128'.Īccording to the scan tool's manual, P0128 is a generic trouble code.
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