Speedometer stopped working?

Tiny
ABHERRAN
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
My speedometer was working fine and one day I got in it, started going down the road and it started not working again.
Friday, December 11th, 2009 AT 2:03 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Sounds like you have an issue with the vehicle speed sensor (VSS). The VSS is located on the transfer case housing (see diagram).
The VSS measures the rotation of the output shaft and translates that to the speed on the dash.
It can stop working due to losing its calibration overtime from all the heat and vibration.
Check the connector and make sure it is secured and clear of any corrosion.

You might find this video helpful:

https://youtu.be/f3bETtCIdxM

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.
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Monday, October 4th, 2021 AT 8:06 AM

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