I have a tpms light on in my 2014 TL SH-AWD, I’m guessing now that it’s not any particular sensor and actually the main module that’s bad as there wasn’t any errors before and now all 4 sensors aren’t sending info to ecu. I got a CGSULIT brand OBD2 code reader on Amazon which can’t find any error codes now and can’t access vehicle component tests

 

It's entirely possible that the sensors (if original) have finally had their batteries die.