Speedometer/shift issues?

2001 CHEVROLET BLAZER
176,000 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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E BONEZ
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  • 5 POSTS
My speedometer quit working, and it won't shift from 2nd to 3rd. I have replaced the vehicle speed sensor.. no change.
Oct 28, 2024 at 12:01 PM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 POSTS
So there are two VSS's on this car because it is 4wd. The one you want to change is not on the transmission rather on the transfer case. Here is the location of the sensor you need to change. Check out the images (below). Let us know if you need anything else.
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Oct 28, 2024 at 2:23 PM
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E BONEZ
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  • 5 POSTS
I will replace that one I'll will let you know if it resolved my issue give me a couple days! Thank you!
Oct 28, 2024 at 7:08 PM
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E BONEZ
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Is this true for the 4 button 4wheel drive?
Oct 28, 2024 at 7:13 PM
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STRAILER
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Yes, the car uses the rear VSS sensor for the PCM input for the speedo and transmission controls.
Oct 29, 2024 at 11:01 AM
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E BONEZ
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  • 5 POSTS
So I replaced the speed sensor. no change, speedometer not working and shifting is not working. I have found a 30-amp relay on the passenger side by the battery that was blown. I'm not sure what this is for in the first place or if it would relate to my original issue.
Nov 18, 2024 at 2:40 PM
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E BONEZ
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  • 5 POSTS
30 amp fuse not relay.
Nov 18, 2024 at 2:41 PM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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I would check the fuses for the cluster which I have included in the images below. It also shows the wiring for the VSS sensors which if the fuses are okay you will need to check, here is a guide to help you and the complete VSS and speedometer wiring diagrams:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Please let us know what happens.
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Nov 19, 2024 at 9:28 AM