Question about 2002 Chevrolet Malibu

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Check light on Chevy Malibu 2002

Ashart81 : where do you get the code P0128 from? I have a check light steady and cannot get solution. thanks

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P0128 - Coolant Thermostat Below Thermostat Regulating Temperature
REPLACE THE THERMOSTAT THE ENGINE IS NOT REACHING CORRECT OPERATING TEMPERATURE, 190-195 DEGREE'S FAHRENHEIT.

Posted on Feb 19, 2009

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Emissions code for chevy malibu PO128 & 130


Code P0128 is for the cooling system you should replace the thermostat. Code P0130 H02S circuit closed loop (cl) performance (bank1 sansor1) you have to replace the #1 oxygen sensor.

Jan 26, 2014 | 2004 Chevrolet Malibu

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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

Check Engine Code P0128


Look for air bleeds, sounds like the coolant has air pockets. And ALWAYS check coolent level with heater set to full heat, or water valves would be closed, and blocking coolant...

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2002 chevy malibu transmission soleniod


It doesn't sound like a solenoid, check the universals and if it's not those, it is more than likely a linkage problem,

Please rate this answer. Thank you.

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engine light came on once before plugs changed went away now back on steady this time not blinking has loss of power with pedal to floorboard then comes in but when comea to a stop idles like going to die

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P0128 code


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

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that code telling you to service your coolant system,

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2002 Chevy Malibu - Oil in Coolant Tank


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.

Feb 03, 2009 | 2002 Chevrolet Malibu

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