Welcome to 2CarPros.
When the ECM detects a very low vehicle speed, while the vehicle is in motion, DTC P0502 sets. With that in mind, there is a diagnostic flow chart that one needs to work through to identify the cause of the problem. I have attached them below. If there is something you can't read, let me know.
Here are a few links that will help you complete the diagnostic tests:
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-check-wiring
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As far as the odometer, if it isn't working, the instrument cluster most likely needs replaced. If you look at picture 4, it contains the diagnostic flow chart for a faulty odometer.
I hope something here helps. Let me know if you have other questions or need anything.
Take care,
Joe
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Saturday, March 16th, 2019 AT 4:57 PM