I have the same problem on an '89 Dodge Dynasty. I am told that the odometer and speedometer in my car are driven by separate cables and that I simply need a new cable for my odometer to function properly again. I have not verified this information, but it might get you on track.
I would say you have a problem with the dash cluster. If both speedometer and odometer were not working I would say the problem may be the speed sensor but being only the odometer is out I would blame the cluster. I believe you will have to replace the cluster as a whole with a reconditioned unit. This will probably be a dealer item only.
Probably a power spike, often when a Caravan is "jumped". Try pushing the odometer/trip odometer button for 4-8 seconds. When it starts running a diagnostic test the speedometer should start jumping around and then reset itself. If it doesn't last, you may have a bad circuit. If a 100.??? comes up, you have problem of some type, maybe related-maybe not.
That depends on the year, make, and model. Most newer cars do not have a dedicated speedometer or odometer wire. The speed sensors are also used for shift timing. If it as old enough vehicle that has a dedicated speed sensor the speedometer and cruise would also not work. Some vehicles, such as 1998 on up Dodge trucks, use the abs sensors for the speedometer and odometer.
There is no speedometer cable on a 1995 caravan. it is done by a speed sensor on the transmission and digtal data is sent to the computer and the computer then sends the signal to the speedometer. This is the case even when the speedometer looks analog. Likely a bad speedometer is the cause if it does not move as the speed sensor is used for other functions and would trip the "check engine" light if it was bad. the speedometer is part of the instrument cluster and likely you would need to change the whole thing.
When those things on my 92 B250 did not work, I replaced the speed sensor located on the transmission tailshaft and that fixed the problems. Hope that helped! Mark When the speedometer and odometer did not work in my 1990 B250, I had to replace the speed sensor, instrument cluster (speedometer) and replace a tiny gear (odometer) in order to get them working properly
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