I have a 2015 F56 S, modified and started OK this morning. Drove 10 miles to store and would not lock, button on door or on fob. Had to use key next to columb to start car, transmitter not detected on idiot light. Got home and changed fob battery, checked voltage on fob and 3.05V on both fobs. Still does not work. TPMS works OK. Thinking it may be comfort access module on footwell controller. No error codes on Foxwell scanner. Lost preset radio stations which is probably no recognizing key fob. Any thoughts. The replaement module costs about $350 (discounted $167).