DTC U0401-68: Invalid Data Received From ECM/Pcm - Event Information: Action

WARNING: This page is about a different car, the 2015 Land Rover LR2, 2014 Land Rover LR2, and 2013 Land Rover LR2. However, it is still accessible from the selected car via links, so may be relevant.

Check the engine control module for related DTCs
Clear the DTC and retest
If the DTC returns, using the manufacturer approved diagnostic system check and install latest relevant level of software to the rear differential control module