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2004 Chevrolet Trailblazer Question: 2004 chevy trailblazer i was told to replace the thermostat, then dealer said no

 

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Mountain man 1, 4.2L 6 Cylinder, Richmond, VA, March 18, 2013, 11:36
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the dealer said it may just need oil changed or more coolant that service engine does not mean to replace the thermostat they said it takes a 10,000 dollar machine to read it properly not the one at the auto parts store.

???? any ideas on this issue.
Mountain man1

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  • Answer #1

    Miles Auto Services (884 Answers) , Richmond, VA - (804) 885-4176
    milesauto March 18, 2013, 11:41
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     Master

    What is your problem ? Is there waring lamp on?

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    Mountain man 1, March 18, 2013, 11:47
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    The reading says service engine soon.?
    I just had oil changed about 2 weeks ago dealer says the reset should have been done when oil was changed it was not?????

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    milesauto, March 18, 2013, 12:05
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     Master

    That does not sound like a maintenance reminder light....It may need to have the system tested for faults related to emissions etc.

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  • Answer #2

    February 08, 2015, 17:59
     Rookie

    If the "service engine soon" light is illuminated in the cluster while the engine is running then you have a concern that needs to be taken care of. The power train control module has a code stored in its memory. If the code is a p0128 then you probably need to replace the thermostat because it is opening before it should. This is a very common problem with the trailblazer equipped with the 4.2 L engine.

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