Question about 2004 GMC Envoy

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My check engine light is on and I can't pass inspection because of this problem. The code that appears is po128. What exactly does that mean?

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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.

Posted on May 07, 2010

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2004 buick rainer, po128 pending has heat the check engine light comes on and goes out temp is 195


PO 128 is a coolant temperature beyond threshold code. It means your thermostat is stuck and needs to be replaced.

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My 2000 vw passat will not pass inspection because of codes, the check engine light has always been on. what do i do?


Yes, fix it.
When the check engine light is on it's in limp home mode. Means it goes to set values and runs poorly...
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03 mazda mpv didn't pass inspection because of fault PO431?


Have the catalytic converter and your O2 sensor checked.

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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

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I got a PO128 reading I changed the theromstat but the engine light is still on what can I do to get the light off


When the Check Engine light comes on,you need to clear the code, either use a scan tool to clear the code or you can use 3 consecutive ignition cycle,that the diagnostic runs and not fails, Or A history of 40 consecutive warm up cycles if no failure are reported by this or any other emission relateddiagnostic, If the relacement thermostat and you cleared the close and this code appears You need to inspect the ECT sensor or even the ECT harness

Nov 26, 2012 | 2005 Chevrolet Equinox

1 Answer

Po128 code on 2002 kia rio


it mite be a o2 cencer

Nov 24, 2011 | 2002 Kia Rio

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Check engine light has been on for a long time. 4 diagnostic codes: PO128, PO315, PO604, PO62F I can't find what the codes mean.


p0128 is coolant temperature sensor below range, change sensor. p0604 is pcm random access mem ( ram error. it may mean the pcm has failed, have it checked out..

Aug 04, 2011 | 2007 Chevrolet Cobalt Coupe

1 Answer

Check engine light on 2005 isuzu ascender, code PO128 is given...help!!


that code means that the coolant is cooler than it is supposed to be and it cannot be regulated...which means the thermostat is stuck open or broken,so replace the thermostat and that should solve your problem,hope this sheds a little light on it!

Sep 26, 2009 | 2005 Isuzu Ascender

1 Answer

Po128 code on 2001 corvette


replace the thermostat. computer sees engine is running too cool thermostat stuck open.

Nov 10, 2008 | 2001 Chevrolet Corvette

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