1995 Chevy Astro faulty speedometer

1995 CHEVROLET ASTRO
78,000 MILES • 6 CYL • AWD • AUTOMATIC
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YORKW12
  • MEMBER
  • 1 POST
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.
Jul 28, 2009 at 8:31 PM
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DANAUTHIER
  • ✓ASE Certified Mechanic
  • 156 POSTS
  • ASE Certified Mechanic
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
Jul 28, 2009 at 10:55 PM
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