I have been working on this 2011 camaro ss for a month now (engine work) and it has the worst electrical drain it came to me like this if it sat overnight it would die. it has me completely stumped. i have to get a new battery for it almost every day its terrible. ive checked every fuse replaced most of them even. gave the car a new alternator, i checked every power and ground wire and re wrapped them and tightened them down and it made no difference. i did a cam swap and had the car running and driving parked it and came back yesterday the interior guy got overspray paint into the obd 2 port and i didnt realize and when i plugged in my scanner it woulnt read any vcm so i disconnected the battery and waited 15 mins and reconnected luckily it was aem bypass and the real one was clean behind it, and it worked again just to read the car and some scanning and then the interior guy pulled the killswitch out which was jumped to the ecu/ignition fuse while i was taking a log, can this brick the pcm? when i went to write it couldnt connect to write or scan . and now it wont read vcm suite OR OR EVEN START. no starter sound or fuel pump click. i have no idea ive been chasing this problem for a month and now the paint guy. any help would be appreciated because i really have no idea. ive replaced the alternator for a high amp one, new yellow top battery every day, some new fuses on the ugly ones, i even put a silverado pcm in there (junkyard gave me the wrong one ) and it had trouble reading. i disconnected the battery and waited 15 minutes and came back it then read fine but i was scared to start it because the it was for a 4.8 engine. i think it might be the bcm or something else draining the battery but i dont know how to check and im done throwing money at the car guessing i need some way to find out what is draining the power on this car when it sits overnight and now it might be bricked and stopping it from reading consitently and starting at all. i called the dealer they said it might be the bcm but they have no idea and if it was the bcm its discontinued and backordered forever .