1994 GMC Truck jumping speedometer

Tiny
JAMESERVEN
  • MEMBER
  • 1994 GMC TRUCK
  • V8
  • 4WD
  • MANUAL
  • 158,000 MILES
My speedometer started jumping up and down.
It would read correctly at 60 mph and then start jumping between 20 and 45 mph then it would read fine. How do I know if it is my vehicle speed sensor or my speedometer? Could it be something else?
Thanks
Saturday, May 1st, 2010 AT 8:29 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It could be your speed sensor, you can check the ohms to see if it's grounding out or having to high of ohms. Or it could be the speedo or the wiring or connections are in poor shape. I'd start at teh bottom as that is more in the weather than the speedo head.
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Wednesday, May 26th, 2010 AT 3:44 PM

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