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1995 Chevy Astro faulty speedometer

Tiny
YORKW12
  • MEMBER
  • 1995 CHEVROLET ASTRO
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 78,000 MILES
My speedometer just started reading about 25 mph more than actual ground speed. This all started after sitting for about 2 weeks. I checked all of the wiring and al of the fuses and nothing was bad or loose.
Tuesday, July 28th, 2009 AT 8:31 PM

1 Reply

Tiny
DANAUTHIER
  • MECHANIC
  • 156 POSTS
Check the vehicle speed sensor, located in the right side of the transmission extension housing. This sensor reports the vehicle speed to the pcm, but sometimes the signal is validated (compaired) to the front wheel speed sensor. If the rear sensor is failing (or failed) you will get an erronious reading from the speedometer. Check connection to this ssensor for corrosion as well since the vehicle has sat for a period of time.
Just a suggestion but have seen this myself on many occasions
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Tuesday, July 28th, 2009 AT 10:55 PM

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