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The speedo is electronic, only 2 things will cause this, the vehicle speed sensor, the other is the speedo head itself, this assumes you have checked the fuses, the most likely problem is the speedo itself.
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The sensor is usually located at the passenger side axel near the wheel drum. It works by sending a signal to the PCM at the exact velocity. I think it is the sensor.
I thought this year of Santa Fe had a 100k Warranty? If so, take it to the dealer and get it fixed. Even if it's not under warranty, take it and get it fixed! This is dangerous to use with the cruise control!! Do not use the Cruise Control until you get this fixed. It sounds like a bad speedomoter sensor, and that is confusing the Cruise Control. Either your speedometer is going to stop working altogether, or your going to RAM someone from behind going at a DANGEROUS rate of speed. Take it and get it fixed, and do not use the Cruise Control until it is fixed.
The odometer is driven by a small electic motor. It receives the same signal the speedometer receives. If the odometer motor is no longer functioning, I'm affraid the entire instrument panel cluster will have to be replaced.
Any other questions, let me know.
Regards,
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