working with a bobcat T590 having a M4404 active warning(auxilliary no communication). No attachments will function. I have checked fuses and relays. A call to local dealer claims it's most likely the ECU. My only other thought would be a short circuit somewhere in the wire harness, but I think it's doubtful. Have no way to test ECU and doesn't make sense to have a service call and find out that's not the problem. Machine has less then 800 hours. Any thoughts?
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auxilliary no communication
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crewchief888
Senior Member
might want to check the connectors on the aux controller and make sure they are plugged all the way in.
