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If the speedometer in your Voyager is not working, you might have a problem with a disconnected cable or with the fuse to the display. You could also have an issue with a sensor.
Speedometer cable (most common) Speedometer head Gear on transmission end of speedometer cable
Most likely reason is the cable kinked or broke. Might be able to be more specific with more details.
I took my 02 liberty 6 cyl. to have it diagnosed. Stated that the speed output sensor was bad. I bought a new one and replaced it. (There are two sensors on this transmission - input and output) Speedometer still not working! I swapped sensors, since it is the same sensor for input or output, but still no speedometer working. There are two more sensors in the differential. Those did not appear on the diagnostic tool but i might consider replacing. If anyone has ran into this problem yet, please spread the wealth. Thanks.
The speedometer in my 2001 Civic stopped working or would reflect very high speeds like 120 mph when I was going about 40 mph. I took it to the mechanic, he tested the speed sensor (which often seems to be the culprit) and said it was working fine. He first thought it might be the instrument cluster, but suggested I try cleaning the corrosion off the battery terminals to "reset" the speedometer first. He didn't want to do it himself b/c of the alarm/radio code. I cleaned them off, and low and behold, the speedometer is working great again. May not work for everyone, but it was an easy fix for me and might be something easy you should try before taking it in.
Your speedometer might not be connected if it does not work. It might also have blown a fuse if it is an electronic speedometer or it could have a wire that is loose.
There might be a problem with the cable.
When it gets very cold outside sometimes the speedtable will get all funky and lose its timing causing it to play 'catchup'
If the abs light is on, then you might have a rear axle speed sensor issue. If not, then you have a cluster problem.
Normally it is the left rear ABS sensor, if that does not fix it then it might be the ABS module. Look around in the BMW forums on how to the sensors with and ohm meter
Either the Speedometer itself is bad or the speedometer cable is. either one isn't too difficult if you have pulled a dashboard out before.
check your fusible link, its connected to your positive battery cable,check for burnt marks or it might be swollen.