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Hi I changed the driverside exhaust manifold and the harness in the wheel compartment which has a gray lock handle broke, the handle broke and I managed to get it to lock but I am getting this code.  I believe the harness will have to be replaced since it seems that is the problem.  Did not have the issue before but the gray handle came off because the nipples broke that keep it attached.  I guess I am wondering if you concur that that harness would be the issue or is there a way to reset the system now that the harness is locked back to the controller?  If so do you have a part number for it from Ford, I believe they call it the automatic transmission wiring harness, also how do I clear the codes I have a tuner and clear it but it stays on the dash, do I need to unplug the batteries for a time I would suspect.   The DEF and ERG have been deleted. Thanks for your help.
Vehicle: 2008 F350 Super Duty 6.4

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U0121 Lost communication with ABS control module

Your going to have to test for voltage, wen there is a  U code its more a lost of power such as its fuse or disconnection but in this case you would need to check for power, even if you did correct the connection power has to be checed

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