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Service Engine Light

Discussion in 'Chevy Trailblazer Forum (GMC Envoy)' started by pennyhm, Mar 9, 2007.

  1. pennyhm

    pennyhm New Member

    I have a 2003 TrailBlazer, recently purchased it used, no Car Fax purchased before buying the Chevrolet. Has been running fine, a clicking noise every now and then from under the hood. Service Engine light came on when turning a corner this afternoon. Fluids look ok and are full, had to add a little bit of coolant. Belts are ok. Anything else I can check or I should do before taking it in for service? I had a MPV a few years ago that did this right under 80K miles (which the TB is at now -- about 78K miles) and all that was going on w/ it is that it needed the exhaust system serviced. Wondering if this happens w/ the Trail Blazers as well. Thanks for any tips, advice, etc.
  2. Cableguy

    Cableguy Epic Member 5+ Years ROTM Winner 1000 Posts

    Welcome aboard pennyhm, The clicking noise could be 100 things. As for sevice engine soon light you'll need to identify code for sure. Depending on that exhaust leak (how big) it could be back pressure issue. My 03 was missing 3 PCM updates on software and O2 sensor was gone, but engine light was not on go figure. It would barely run at one point.
    See what dealer says and go from there. Good luck
  3. pennyhm

    pennyhm New Member

    Thanks cableguy. A question .. how do you get PCM updates? From the dealership? thanks!
  4. unplugged

    unplugged Epic Member 5+ Years 1000 Posts

    You can go to many local parts stores ie; AutoZone and they can read the codes. With the code info we might have more info for you.
  5. Cableguy

    Cableguy Epic Member 5+ Years ROTM Winner 1000 Posts

    To my knowledge you can only do baseline software updates at dealership.
    Mine ran smooth as glass after update. I don't think I paid anything.

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