Question about 1999 GMC Suburban

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1999 GMC 2500 suburban 4wd wont shift automatically anymore. Have to rev engine up to high rpms and shift manually.

Posted by Anonymous on

  • Anonymous Sep 12, 2010

    no error lights and no check engine light. Not a prob necessarily 4WD. Running in 2WD won't shift automatically anymore without reving up engine and shfting column manually. Ran fine until alll of a sudden this happened.

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Hi,

Tell me few more details :-

1 Do you see check engine light being on?
2.Any other error light flashing on the dash?
3. Is this an intermittent or permanent problem?

Let me know,so that we could proceed.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Sep 12, 2010

  • taran_2005
    taran_2005 Sep 12, 2010

    Thanks for your response!!

    This seems to be a bad news.If the engine were malfunctioning,you should be getting engine codes present in the computer.If the engine ECM (computer) were experiencing a problem with sensing a load on the engine,(like a bad TPS {throttle position sensor} or MAP {Manifold absolute pressure}) it would delay shifting,but only minimally.If it won't shift at all till you get to 4-5k rpms,there is a problem with the transmission.More often you need to rebuilt the transmission.

    I would advise you to contact the dealer at the earliest to see what options you have. The information is purely based on the details you gave.

    Let me know,if needed further assistance.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!


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