Question about 2005 GMC Envoy

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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?

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PO-128 Coolant Thermostat, Temp Below Regulating Temperature

Leaking or stuck open thermostat
Coolant temp sensor
Cylinder head temp sensor
Engine coolant level

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

Posted on May 25, 2010

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