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2006 GMC Envoy Question: i replaced the thermostat and i am still setting p0128 code.what next.

 

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teslafan, 4.2L 6 Cylinder, Pensacola, FL, January 13, 2014, 16:05
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The scan tool i have will not read sensors or tell me anything other than the code that has been set. i don't want to go to a mechanic and would like to know the most likely problem causing this code. i am not the one driving the car and am not sure when and under what conditions the code is being set, i think it is happening after the car is warmed up and been driven a while.

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  • Answer #1

    G. T. Service Center (4142 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG January 13, 2014, 16:25
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     Master

    If you were able to read data, the temperature sensor needs to be monitored. And by the way, we are Technicians/Mechanics.

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  • Answer #2

    Dr Quick January 13, 2014, 16:33
     Enthusiast

    Could also be that water temperature sensor is not working right.

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    ProfessorG, January 13, 2014, 16:42
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     Master

    Just looking on a wiring diagram and was wondering where the water temp sensor is, all I see is a ECT for the computer, which also runs on the CAN line to the instrument cluster. Could you help me out, Please.

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