Question about 1988 Chevrolet C1500

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Speedo quits Once I drive my 1988 1/2 T silverado for a short distance in warm/hot weather i lose the speedo..... in real warm weather it won't work at all from the first start-up of the day..... I get a flashing red brake light at first and then a check engine light will also come on.....

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  • Anonymous Sep 29, 2008

    i have the same problem, I was told to just change the sensor in the side of the tranny.

  • jon_nba_1fan Oct 20, 2008

    i also have the same problem but the speedometer just stopped working and i went to a local autozone and they told me i needed a new speedometer cable. It was only $10 all i need to do is connect it and see if it works.

  • nitro325 Jan 12, 2009

    I have same problem - except when it's cold it works for a couple miles then it seems the tranny warms up and the speedo will stop working.


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There is an inherent problem with the 1988 trucks as there is a vehicle speed sensor that was no good to start with. The check engine light will produce a code in the prom that indicates the vss, check for a replacement either from GM, or a reputable auto parts store and replace it. It is located at the back of the transmission on the tail shaft just before the driveshaft. Good luck.

Posted on Feb 10, 2009

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