Can anyone tell me what this means? It is a 2013 G37x

 

Looks like the ECM is not communicating with the BCM (Engine control module - Body Control Module) Usually codes like these develop when the BCM has had water damage from leaking roof drains.

Could you offer additional info on history?
When did it start?
Was it random or intermittent?
Was it after being parked after some time?
After harsh rains?
ETC?

 

It started with limp mode starts which with a quick ECU reset car was fine. Random, like once a week. Then it was no crank many lights on dash, cooling fans running and reset not working. An overnight disconnect of battery and fine. Then same but 2-3 days before it works again heavy rains only half the time. I can tell before I push start if it going to work by the brake pedal. If it’s rock hard, no crank. If it feels normal she will start? About a two month progression to date.
btw, garage kept and always a better shot in am if that means anything?