I sent my PCM out to East Coast Superchargers for a mail-order tune. I got it back, installed it, and everything was fine. It had about 3 hours of idle time on it and maybe 30 minutes of driving. I drove it to town one day and noticed all my gauges except the speedometer and tach weren't working and my ABS and airbag light were on as well as the 'check gauges' light. It was still running. Came back and it starts but same issue, notice my front windows won't go up or down, my power locks don't work, heated seats didn't work, and my radio was off, no power to it. Got it home, turned it off, it wouldn't restart. Tried leaving the battery cable off for a day and still same issue. Sent PCM back to have it checked, checked out okay. I didn't notice I had the key in ACC when I hooked the battery back up, I had radio power and windows, seemed like everything was okay. I started it and pulled it out, made it 20 feet before I got the same problems again. It would restart multiple times even with the issues, but on the 7th-6th attempt, no crank no start. I could get it too act normal if I took the cable off and reconnected it, even my radio would come on but the volume button turned it down even if I pushed 'UP' on the steering wheel controls. It has an aftermarket stereo with a PAC interface. I unhooked the battery and removed the interface, same problem. I cleaned the grounds under the hood that I could find, one on the driver firewall, one forward of that on the fender, and one on the passenger fender, same issue. The big fuse is good as well. Removed the BCM (under the 2nd row seat) and checked the ribbon cable for open circuits, it was good. Looked in the module and no obvious electrical shorts. Other BCM functions seem too work, like the interior lights. I even replaced the ignition switch and that didn't fix it. When I turn the key to 'run' the security light comes on and goes off like it should. If I jump the starter with the key in 'run', it starts and runs for a few seconds, the way they do when security disables them.
I have found a BCM with the same p/n and the 'red' sticker just like mine, but I didn't want too try it unless I checked here first. I have heard some people having this issue with performance tuning, but they said it checked out on their end. I can access the PCM with a scan tool, can't see the BCM, ABS module, airbag module, or the transmission module (but it will shift when it is running) with the scan tool.
I have found a BCM with the same p/n and the 'red' sticker just like mine, but I didn't want too try it unless I checked here first. I have heard some people having this issue with performance tuning, but they said it checked out on their end. I can access the PCM with a scan tool, can't see the BCM, ABS module, airbag module, or the transmission module (but it will shift when it is running) with the scan tool.