Question about 2003 Saturn VUE

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Service engine soon light on 2003 Saturn Vue

My service engine soon light has come on with the code P0128. the car is not overheating so i assume it's not the thermostat. it may be the engine coolant temperature sensor ECTS. does anyone know where it's located on a 2003 Saturn Vue 6 cycl.? is it easy to replace?

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  • 4 more comments 
  • lojo999 Feb 12, 2009

    so you don't think it's the ECTS? the code reading i got said it could be either.

  • sperlmutter1 Mar 29, 2009

    Where is it located under the hood and how can i change it ou?

  • Anonymous Mar 21, 2014

    coolant low sensor

  • Anonymous Mar 25, 2014

    size and step by step

  • Anonymous Mar 29, 2014

    also reduced power light comes on frequently

  • Anonymous Mar 29, 2014

    was told it is an emissions issue? does that mean its a fuse?

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Here is the definition of the code in GM manual:
P0128 - Coolant Thermostat Below Thermostat Regulating Temperature, this indicates the engine is running cold, u need a thermostat

Posted on Feb 12, 2009

  • yadayada
    yadayada Feb 12, 2009

    My info comes from GM, it says the engine is running to cold, I have replaced maybe 2 ECT's ever in 20 years of work on computer controlled fuel injection cars, which all use an ECT.

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