PCM and BCM communication loss

[Dtot79]

My 2020 gt auto lost power to most accessory and wont even attempt to crank. ran when i parked it in a buddys shop, stone dead 2 hours later trying to start it up to leave. start button flashes rapidly but wont turn on accessory or crank. keyfob wont work but i can manually lock and unlock doors and roll up windows ect. radio doesnt work. code reader says "cant communicate with PCM and BCM"

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[Falk03]

Battery? If the battery is too low/weak, this can happen.

 

[Dtot79]

so just incase anyone else runs into this, there is a BCM connector in the passenger footwell right at the upper edge of the carpet next to the firewall grommet. Aparently mine was not latched from the factory, or came unlatched somehow and worked itself like a quarter inch loose. plugged back in, cleared codes, all is good

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