Couple questions. First, has the code reader worked on this vehicle previously? If so we need to check voltage at the data link connector to see what pins you have voltage on. You should have 12 volts on pin 16 which is where we need to start.
Lastly the shifting and speedometer issue is most likely the vehicle speed sensor issue but it is odd that all this started with the failure of the belt and battery.
Let's take this step by step and see what turns up. Thanks
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Saturday, October 17th, 2020 AT 7:26 PM