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Thread: 93 Deville, speedometer problems

  1. #1
    msgleaf24 is offline Cadillac Owners Member
    Automobile(s): 93 Cadillac deville
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    93 Deville, speedometer problems

    Hi...I have a 93 Cadillac Deville and for the past few days the speedometer jumps up and down randomly from my current speed to lower to zero MPH. One time I was accelerating (20-30 MPH) and could feel it jolt forward a little bit. I tried looking up some info online but the shop told me I do not have a speedometer cable in my car and they would have to look at it...anyone know what could be wrong?? Any advice would help thank you!


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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2003 DHS - two-2002 DHS's, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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    Re: 93 Deville, speedometer problems

    Quote Originally Posted by msgleaf24 View Post
    Hi...I have a 93 Cadillac Deville and for the past few days the speedometer jumps up and down randomly from my current speed to lower to zero MPH. One time I was accelerating (20-30 MPH) and could feel it jolt forward a little bit. I tried looking up some info online but the shop told me I do not have a speedometer cable in my car and they would have to look at it...anyone know what could be wrong?? Any advice would help thank you!
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  4. #3
    r_2016's Avatar
    r_2016 is offline Cadillac Owners Fanatic
    Automobile(s): 2005 Lexus LS430, 1993 Deville
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    Re: 93 Deville, speedometer problems

    Hmm, it could be the speed sensor that is going out. I saw a video the other day about a bad diode in an alternator causing speedometer issues. The only way to check this is to hook up an oscilloscope to the alternator to see if that's the issue. Good luck


    http://www.youtube.com/watch?v=MGaHaIXZioA


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