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

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  • Anonymous Sep 12, 2010

    Wont shift automatically at all. I meant the truck is a $Wd, but in 2wd the truck will not shift automaticvally without reving engine and shifting manually.

  • 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.

  • Anonymous Sep 12, 2010

    if any sensor was bad the on board computer would read it and record a code and the engine light would come on. It is NOT showing any engine light or codes.

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Http://gmcowners.com/gmc-forum/showthread.php?t=8480 this should help you scroll down to molson he explains it to you hope this helps

Posted on Sep 12, 2010

  • Daniel Berry Sep 12, 2010

    sounds like you need to replace selonoid number is burned out

  • Daniel Berry Sep 12, 2010

    heres what i would do i would take the transmition and a voltmeter and check every sensor conected to that trany for low voltage but that transmition you have the gears run on metal bands and if those bands stretch then you would loose a gear and this is a high possibility could be need a tranny rebuild too to replace them but id start with the sensors maybe a selonoid is not working one for each gear that sends signal back and forth

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taran_2005
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SOURCE: 1999 GMC 2500 suburban 4wd

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

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