R7404 code on e26 excavator

[Tbeach61]

Bought a used e26 not long ago. Have been having issues with it running. Some days it will start fine and run and other days it starts up and runs about a minute and shuts off. Throws a R7404 code and the screen flashes off and on. Any ideas if it's the gateway controller bad or something else

 

[brdgbldr]

The error code I found for R7404 is : Main Controller No Communication

I would check for bad connections or wire rub throughs. Check the pins in the connectors real close and clean them before reconnecting and see if that helps.

I am not familiar with that specific machine so take this advise with a grain of salt.