Good morning, nice to hear from you.
Is this a new or used transmission?
Did you have the TCM programmed after installing?
https://www.2carpros.com/articles/automatic-transmission-problems
I attached a wiring diagram for you to view. Check the fuses in the diagram for power on both sides.
https://www.2carpros.com/articles/how-to-check-wiring
https://www.2carpros.com/articles/how-to-check-a-car-fuse
This sounds like a bad transmission.
The 500 is for the vehicle speed sensor.
The U code is a no communication issue with the TCM.
https://www.2carpros.com/articles/can-scan-controller-area-network-easy
Roy
1. REMOVE BATTERY
2. REMOVE AIR CLEANER ASSEMBLY
3. REMOVE SPEED SENSOR (NT SENSOR)
(a)Disconnect the speed sensor connector.
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(b)Remove the bolt and speed sensor.
4. REMOVE SPEED SENSOR (NC SENSOR)
(a)Disconnect the speed sensor connector.
imageOpen In New TabZoom/Print
(b)Remove the bolt and speed sensor.
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Thursday, December 31st, 2020 AT 4:14 AM