2012 Chevy Equinox P0716 Code: Transmission Input Sensor Replacement Failed - Now Won't Engage in Any Gear

I own a 2012 Chevrolet Equinox with a 2.4L engine. Recently, the vehicle began exhibiting driving issues. I visited a local auto parts store to scan for trouble codes using their code reader, and it detected fault code P0716. The technician provided a printed explanation of this code, which indicates a problem with the transmission input speed sensor. After researching online, I believed replacing the input sensor might resolve the issue and attempted a DIY repair by swapping both the input and output transmission sensors. Following the replacement, I reassembled all components and refilled the transmission with the correct fluid type. However, after this work, the vehicle now fails to engage into any gear. It appears to be stuck in neutral—manual movement of the vehicle is possible, indicating no mechanical lockup but a complete lack of gear engagement. I'm concerned that I may have made a mistake during the repair process. What steps should I take next? Could the P0716 code be related to sensor misalignment or wiring issues? Is there a possibility that replacing both sensors caused a system reset or damage? Any advice on diagnosing or fixing this issue would be greatly appreciated, especially for a 2012 Chevy Equinox with a manual transmission control system.