1999 Cadillac Sts Speedometer Jups Down Drive Round 80mph

1999 CADILLAC STS
175,000 MILES
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ANONYMOUS
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My speedometer jups up and down when i drive a round 80mph.
Feb 26, 2013 at 9:09 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
If electric speedo, may be a faulty speed sensor.
Feb 27, 2013 at 10:52 AM
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