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My speedometer went crazy on me the other day and read 25 mph when I was stopped

Tiny
ANDYB436
  • MEMBER
  • 2003 CHEVROLET TRUCK
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 93,000 MILES
My speedometer went crazy on me the other day and read 25 mph when I was stopped and I wanted to know how or what I can do to fix the problem as soon as possible. Thank you
Thursday, January 21st, 2010 AT 3:15 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

This issue could be due to a faulty vehicle speed sensor (VSS). It can also be for a bad stepper motor in the gauge cluster.

The VSS is located on the side of the transmission housing. It read the rotation of the transmission shaft and sends that information to the ECM. Then that gets translated into the gauge readout.
A faulty VSS will stop the speedometer from working.

If the stepper motor is faulty you will have to remove the gauge cluster to access the back of the panel.

Here is a helpful video:

https://youtu.be/_HEC44xENxw

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.
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Thursday, October 21st, 2021 AT 9:18 PM

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