Vermeer 504N, bird nest, odd wire, E51 code

Getting my 504N ready to roll, had birds nest to right of gear box, cleaned it out found a large white wire not plugged into anything,(picture)

all the plugs in that area are tight, Checked monitor, no codes, I when into diagnostic mode shows E51,  is this current or past fault code? Ive had roller 5-6 years and never had a problem with the twine actuator,(its twine only). Arm works as it should manually form monitor.

Do I need to check other things or just head for the field?

 

Attached Thumbnails

• 

Vermeer 504N, bird nest, odd wire, E51 code