Transmission control module (TCM) problems

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Transmission input speed sensor getting low reference voltage

RAM 3500 2014 Ram 6.7 diesel 287091 miles
TCM is only sending 3.20 volts to transmission speed sensor so the transmission isn’t shifting right.
I just rebuilt the transmission it has two years warranty so I took it back
And at the shop that I rebuilt it they told me they couldn’t fix that because that is an electrical problem. I need help with the Diagram
Or if anyone knows what could be the problem. I would appreciate it.
MGG1 from United States a year ago  
MG
1 report 
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