I was getting this 6.4 code on my EDC control panel for the starboard engine. My neutral green light would not come on but the yellow diagnostic button would flash that code and the starboard engine would start.

However after running for a few minutes the engine would idle up to 1000rpm which I know is the “safe mode” and is caused by the engine losing communication/signal with my starboard flybridge controls. So I turned it off.

In my owners manual the cause for that 6.4 code is faulty values from pontentiometers, controls not calibrated, communication faults.

Since my neutral light wasn’t coming on I decided to clean the connections in the plug behind the dash. Tried things again and the neutral green light came on and the engine started but then idled up to 1000rpms again. So I turned it off.

Now the starboard engine won’t start at all and I get nothing when trying to start the starboard engine...when I turn the key push activate and turn to start nothing happens now...no yellow or green lights come on. I hard wired the neutral feed to make sure it wasn’t the plug connections but still got nothing. (Did the same thing on the port side and that engine is staring just fine).

I tried staring in the Pilothouse and the same thing is happening down there. So I am at a lose as to where to investigate next!

Does anyone have and experience or advise for this? Thanks so much!