Question about 1993 GMC Suburban

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Speedometer doesn't work and transmission wont shift

One day my speedometer just quit working and the transmission wouldn't shift into 3rd gear i've replaced the vehicle speed sensor and the pigtail connector to it and it still does the same thing i also tried replacing the vss buffer and still nothing.

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  • southern_out Mar 14, 2009

    it's an electronic controlled transmission and the reason it's not shifting is becuase it doesn't know when to shift becuase it doesn't know how fast it's going

  • Anonymous Mar 22, 2014

    speedometer does not read and will not shift

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Hi, make sure you check the speed cable that runs to the engine, it may be severed. As for the tranny, you have some major gear problems that will require pulling this transmission for a deeper look. i would have a look at the transmission filter as well.

Posted on Mar 11, 2009

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