When you say the code reader wouldn't work, do you mean it wouldn't power on or there was no communication with the vehicle?
As far as the codes, let me know if any are found. I have a feeling the codes will be "U" codes and not the traditional "P" codes if any are stored.
If we get to the point that the cluster needs removed, I attached the directions below. And yes, there is one connector at the top.
Let me know what you find or if you need help with anything.
See pics below.
Images (Click to enlarge)
Monday, September 20th, 2021 AT 8:27 PM