Question about 2002 GMC Envoy XL

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2004 gmc envoy code 0128

I have a 2004 Gmc Envoy putting out a code of 0128 what does this mean?

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This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.

Posted on Sep 09, 2010

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In addition to the previous answer, check to see if your upper radiator hose is partially collapsed. If so that tells you that your thermostat maybe working correctly, but your radiator cap may be faulty. Worse case, take your thermostat off, boil water on the stove, drop thermostat in water after coming to a full boil. If thermostat opens, it's good. If not, I would replace the thermostat and the radiator cap.

Posted on Jul 17, 2012

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Posted on Jan 02, 2017

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I have a 2005 GMC ENVOY with a sensor reading of 0128 and they said it was my sensor bad. But now i am loosing power going up hill. Does this mean i have another problem? If so what could it be?


PO-128 Coolant Thermostat, Temp Below Regulating Temperature

Leaking or stuck open thermostat
Coolant temp sensor
Cylinder head temp sensor
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You could have more than one issue

The only way to answer your questions,is to put a scanner on your vehicle,and see what codes you have.
The codes you get,do not indicate a failure,necessarily
You have to follow a diagnostic process,to find any problems.
If you have been going to auto parts stores,to have codes read,and have no knowledge or intension of doing your own work,you need to find a good repair shop, and just have it repaired,fairly soon

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I have a 2004 Gmc Envoy putting out a code of 0128 what does this mean?


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