Question about 2004 Chevrolet TrailBlazer

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Service engine soon light,

Service engine soon light just came on.

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  • Anonymous Jan 28, 2009

    Ours is the thermostat. Engine is running too cool.

  • kmwmaw01 Jan 30, 2009

    I had the code checked with the same "Coolant Temp too low" result and was told it is the temp sensor. Anybody know where that sensor is?

  • Anonymous Jan 31, 2009

    TRUCK SHAKE IN GEAR WHILE WAITING FOR RED LIGHT TO CHANGE

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  • 101 Answers

I would take it to a major auto parts store and they have diagnostic machines to check your system for errors and let you know what they are. they will also clear them to and the light will go off. But this is the most accurate way of knowing without spending a lot of money

Posted on Jan 25, 2009

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How to reset Service Engine Soon light after replacing gas cap? Took to AutoZone when the Service Engine Soon light came on Error code P0440.


Disconnect the negative battery cable for 30 minutes. Reconnect after and the code will clear. However if the problem persists, the code will come back with in 20 miles or 30 minutes.

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Service engine soon light


A service engine soon light that flashes generally results form an ignition problem with the engine. A service engine soon light that stays on constant results from an emission control system malfunction. A diagnostic scan from the local parts store can determine which emission system is faulty.

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When all these come on at the same time it is the wheel bearing sensor. Usually the wheel bearing needs to be replaced which houses the sensor. A sure way to check is to press your sls button by your shifter and see if the light goes out, If it does not, u will need to have a wheel bearing put in.

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Hello and thank you for using FixYa!

The service engine soon light comes on when a fault is detected in the emission system. The service engine soon light is the same thing as a check engine light. A scan tool will be needed to get the code for the failure, so the proper repairs can be made.

Thanks Jay!

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