Forgive me if this is not posted in the proper section im just seeking some answers, ok for starters ill give you a brief breakdown of my issues,it started the day i got the car, the low coolant light comes and goes and on my wway home with the car the airbag light comes on, i figured bad sensor or module no big deal, well about a week later the security light comes on but it is not a solid light it is flashing while im driving, after about a half hour it goes away and then when the car was shut off and restarted light flashing returns and again goes away after half hour or so... now for the real issue here... i have temp plates and have to go through emissions before i get my actual plates so i figured i could "cheat" the system knowing my car isnt going to pass for o2 codes and a bad maf code..so as im driving to the emission station i pull out my obd2 code scanner scan the codes and AS IM DRIVING ERASE ALL CODES!!! Well, after doing so the car shuts down and i cannot get it to restart.... after doing a relearn procedure on the side of the road car starts lights go out and i drive home now that emissions station is closed....later that night i take the family to walmart to get a few items and upon entering the vehicle i turn the key and BAM security light is blinking again and now i got the whole family with me stranded at walmart because this time the relearn process did nothing...... after buying a new lock cylinder and new keys and relearning yet again still did nothing, so after a lot of discussions someone tells me i probably spiked my BCM in the car.....im looking to know if this would be the case my car still sits at walmart parking lot nonrunning, would code erasure while car is running fry my body control module??? if so what module do i need? a "gm tech" told me that from 99-04 the bcms were known for failure...im unsure if this is true but he said to make sure i get a bcm that has the same options as my car is this correct any help here would be appreciated....btw sorry for the novel and for the record its a 2000 grand prix gt 3.8 automatic