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They both work off of the same cable, so I would say that you have a problem in the speedometer head itself and will need replacing or sent in for repair.
You could have a faulty speedometer/odometer combination meter causing a false Vehicle Speed Sensor error.
My 1998 Sienna had the following symptoms:
- Speedometer and odometer failed intermittently
- The check engine light would come on and I would get a p0500 code in the OBDII.
- The cruise control would stop working at the same time the speedometer failed.
There is a speed sensor in each one of the tires and they feed the speed information to the ABS ECU. From the ABS ECU the speed signal goes to the speedometer/odometer combination meter, and from there it goes to the Engine Control Module and to the Cruise Control ECU. I could see a signal coming into the speedometer/odometer, but no signal going out. Replacing the speedometer/odometer combination meter fixed the problem.
You may need another speedometer. The speed sensor sends a signal to both the speedo and the odometer. So if the sensor fails, both meters would stop working. The speedo gets power from the same circuit as the warning lights.
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