Cab controller module

[jesseisx15]

THANKS FOR REPLIES EVERYONE ... it wasn't doing it before but Last Year shop did ecm update so here is story
I took My 2013 Kenworth with isx 15 to shop but it was giving code for D.E.F freeze . ecm was thinking heater in not working for def tank so first he replaced valve for heater . still same problem then he saw there is an update for my DPF /SCR so he calibrated my ECM with new update ( thats when it start doing it the brake lights thing ) . but same prob again then he checked all the wiring he found there was ground wire coming from ECM about after 20 inch's after ecm . it was stretched it was hidden in wires and wrapped with heat protection . he said there were some other wire were stretched too but when the put these wires on truck they left very small slag ...