Speedometer intermittent

1993 BUICK ROADMASTER
550,000 MILES • 7.5L • V8 • RWD • AUTOMATIC
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ESTHER SAWYER
  • MEMBER
  • 2 POSTS
My speedometer works sporadically. It does not seem to be associated with a certain speed. Sometimes if it is not working and I hit a bump, it will start up. Is it possible there is a loose cable or is there one? Thanks.
Jun 20, 2017 at 10:20 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
these are electrically controlled so you may have a loose ground to dash. there is also a module that runs speedometer so have it scanned for codes and check ground behind left kick panel for loose.
Jun 20, 2017 at 12:15 PM
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ESTHER SAWYER
  • MEMBER
  • 2 POSTS
Thank you!
Jun 23, 2017 at 1:03 AM
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