Model Without Keyless Access With Push Button Start System: DTC Detecting Condition
WARNING: This page is about a different car, the 2016 Subaru Impreza and 2016 Subaru Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.
UART between the TPMS & keyless control module or keyless entry CONTROL MODULE and the body integrated unit is open or shorted, or has communication failure.