Worn Speed Sensor Driven Gear May Cause Speedometer to Stop Working on Isuzu Rodeo

Problem Description and Possible Solution

A worn vehicle speed sensor driven gear can cause the speedometer not to work. Replacing the worn out speed sensor should correct this concern.

Problem Data
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Average mileage: 144,350 (19,800–250,000)
Drive Train affected: 4WD
7 model years affected: 1994, 1995, 1996, 1998, more1999, 2001, 2002
13 people reported this problem
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Viewing 1 - 6 of 6 comments
The bearing for the nylon gear seized, causing the steel worm gear in the transmission to rub the nylon teeth off. It is an easy part to reach and replace, with minimal tools and experience. Hope this helps someone out there.
My Speedometer stopped working at the same time as my Tackometer. The Tack sits at 0, the speed jumps to about 20 mph as soon as the car is started, and fluctuates between about 20 and 40 mph not based on actual speed being driven. My mechanic doesn't know what to do with it. Any ideas? I'm buying a GPS for a short term solution, but need a fix eventually...
The speedometer stopped working.
Issue occurred when I was driving. The mechanic who worked on my vehicle said the unit looked like it had just exploded. It was a couple years ago now, so I'm struggling to remember what parts he did replace. He couldn't make the speedometer work still though, said that it was something with the speedometer and that by law I had to take it to an authorized speedometer testing shop. I never heard that one before, but I've been driving with an intermittently working speedometer for about 5 years now. It seems to work more often when it's cold out. I live in the Denver, CO area. In the summer my speedometer never works, but some days in the winter it does.
I removed the VSS and spun it with my fingers while a friend was watching the odometer. Sure enough the speedometer moved...

Next step is to replace the nylon gear. I hope the gear inside the transmission is ok as well.
Speedometer sticks/stops at 15/20-mph.