15 GT. Numerous codes, (pcm, bcm, apim, pam, dsp, rcm, ipc modules)

[whinin]

Little bit of a history. Car is not being driven due to me not wanting to drive with a poopy carbon fiber clear faded hood. It was fine driving with no codes beginning of March. Finally got a oem replacement installed. Battery has been left unhooked for probably 3 months with me reconnecting it and starting it once a month. Starts and idles fine, but when I went to move it after putting the oem hood back on it has alerts on the dash. Cross traffic, blind spot monitoring, fuel level does not work ( there is 3/4 tank of gas in) and also brake lights stay on when ignition is on (goes off when I turn ign off, not a broken pedal stopper). I ran it yesterday at idle for a good bit, moved it back to its spot and unhooked the battery. Today it shows 10.7v. Bought an adapter, registered for forscan thinking the modules just needed to be reset. That didn't work. I am going to get a new fresh battery tomorrow AM, but curious if anyone has any ideas if that is not the problem. These codes are after I cleared and just turned ign on not running. I have checked all fuses (eng comp, pass comp) and inspected wires. Unhooked and reconnected all pass fuse connectors and inspected them, no signs of water intrusion. Thank you to anyone willing to take a guess!

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[Farkel]

Weak/dying/dead batteries can cause a lot of seemingly unrelated issues. 10.7v is bad. When you get the new one in make sure it's fully charged and reset the BMS. A battery tender is helpful, especially if the car isn't driven often or if you only go for short drives. If you can't use one due to where you have to park, drive the car for at least an hour to get the battery fully charged.

 

[whinin]

New battery and BMS reset did not fix it. Cycled through ign on run ign off 5 times. Still have every code above. Any ideas anyone? I can chase electrical things, just need pointed in a direction to start. Thanks!

 

[whinin]

Pulled the BCM out. No visible anything. Even took the cover off and looked at the backside of the board. No smell either. Tested fuses again and pulled the CB. Reinstalled and no go. So now I'm looking at connector C2280A and C2280C at the BCM since those house most of my problem areas. New battery was at 11.7v. It's on the charger now, I'm not convinced that was a valid test. Hopefully I put that in tomorrow and it's fixed, but not likely. So if so, going to check wires at gateway connector and then behind the radio ICM C2114 connector. Then on to tracing BCM wires. Fun fun.

 

[whinin]

Just wanted to follow up. I had recently replaced my hood release cable and had to unhook the DSP module. I never hooked it back up. Everything is back to normal function now.

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