Question about 2002 Chevrolet Malibu

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2002 Chevy Malibu - Oil in Coolant Tank

I have a 2002 Chevy Malibu and the check engine light came on. I received the code P0128 - coolant temperature below Thermostat Regulating Temp. When I went to check the antifreeze tank there was a layer of oil on the top and what felt like a layer around the inside of the tank. What does this mean and does it have anything to do with the code I received or is this something completely different?

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  • Ashley Arterberry Feb 03, 2009

    I checked the dipstick as well as looking under the cap where you add the oil and it looks like regular oil. It didn't look milky, just like i need an oil change. I kept losing oil as well, i guess it's been going into the coolant tank because there is a lot of oil in there! It's thick and chunky and feels like it's layered up on the inside of the tank.

  • Anonymous Feb 16, 2009

    I have the same problem with my 2001 Chevy Malibu. There is a thick, chunky layer of oil floating in the coolant tank. However, there is no evidence of coolant in engine oil because the dip stick is not milky. I did flush the coolant system and replace the orange Dex-cool with STP green coolant, but the problem remains the same. I also have to fill the coolant tank very often, at least once per month.

  • rightwest Feb 17, 2009

    Hi, where did you get this code P0128 from? Is there check light on or coolant light on steady? I have the same problem which appeared yesterday. The "check" light (the very right) appeared and doesn't go away.

  • jeff4re May 17, 2009

    I have a 2002 Malibu with the 3.1 V6 with the same problem... Oil mixing in the coolant, but no signs of coolant in the oil... Everybody had a different opinion, but only guessing... I had the coolant flushed twice. Have to fill the reservoir once every 2-3 weeks..Very frustrated....

  • alathrom May 25, 2009

    same issue folks i gotta 02 malibu and got oil in the coolant but no coolant in the oil. My dad checked it and he said it is the head gasket on the front but obviously only leaking from oil to water not vice-versa. Also got an engine code that i believe is a clogged cat. It has been driving fine until i have to go up a hill of any size then it bogs down and doesn't want to accelerate anymore

  • ccn7 May 11, 2010

    if you got oil in coolant, you better see if there is coolant in the oil, if there is, could mean blowen head gasget. pull oil dipstick out if the oil looks milkey there is coolant in oil.

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Sounds like your head gasket has a leak. I would also check your dip stick. If there is coolant mixed with the oil also. Then it is your head gasket.

Posted on Feb 03, 2009

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2004 trailblazer code po128


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.

Feb 06, 2013 | 2004 Chevrolet TrailBlazer

1 Answer

I have a 2004 Chevy Impala. As I was driving home yesterday I had the heater on full blast - temp outside appx. 60. The check engine light came on and I had a P0128 code. Could this be due to keeping...


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.


A 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

Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:

  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat


REFERENCE: http://www.obd-codes.com/p0128


I hope this helps a bit!

Jan 11, 2011 | 2002 Chevrolet Venture Passanger

1 Answer

Error code po128


P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

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.

Symptoms: You will likely not notice any drivability problems other than the MIL illumination.

Causes: A 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

Possible Solutions: Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
* Verify coolant strength & level
* Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
* Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
* Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
* If the above items check out good, replace the thermostat
* If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code


Hope helps (remember to rate this answer).

Jan 07, 2011 | 2002 Chevrolet Venture Passanger

2 Answers

I am getting P0128 obd code for my nissan sentra. how to solve this



Take note of the blurb regarding NISSAN products below


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

Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:

  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat
  • If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code

Nov 17, 2010 | 2002 Nissan Sentra

3 Answers

What can keep causing Check engine code P0128


CODE P0128- THERMOSTAT MALFUNCTION. POSSIBLE CAUSES 1. ECT SENSOR IS OUT OF CALIBRATION. 2. CHECK THE OPERATION OF THE THERMOSTAT IT MAY BE STUCK OPEN.3.INSPECT FOR LOW COOLANT LEVEL OR FOR AN INCORRECT COOLANT MIXTURE.

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2007 Chevy Cobalt with p0128 and "---" temp reading


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Have the thermostat replaced

Other possible causes that could trigger this code would be:
Low engine coolant level
faulty cooling fan
faulty coolant temperature sensor
faulty intake air temperature sensor


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1 Answer

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Unless the car is overheating you probably just have a bad temperature sensor probably located on the intake manifold....

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1 Answer

Check light on Chevy Malibu 2002


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