We have installed a 5.3/6l80 into one of our Jeeps as usual. This is the first 2011 LS we have done. I pulled the tune out with the Tune tool and tried to get rid of a couple codes as before. When I go to Transmission diagnostics I get the message "The LL8 controller does not support this segment".

When we run the vehicle everything is fine except the MIL comes on and U0121 is being reported by the TCM.

Any help is appreciated.