Hello,
The odometer and the speedometer both runs from the signal provided by the vehicle speed sensor in the transmission.
Since the speedometer is working it is likely that the issue is with the odometer part of the gauge cluster. The gears that turns the odometer could be loose or broken. Or could be a issue with the harness that powers the odometer gears.
I have attached the diagnostics procedure for your reference.
https://www.youtube.com/c/2carpros/featured
Please let me know of any questions.
Thank you.
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Sunday, August 29th, 2021 AT 1:17 PM