Afternoon, I need some help with this car....

Recently I have started getting a U0001-82 code (I have listed below) and it has been triggering all kinds of CIL's including charging faults. I have charged the battery and tested it in the car as well as out of the car to register 12.7 Volts and 14.34 Volts while running. I checked using a handheld multimeter and an icarsoft. To remedy the charging fault, I reset the BMS and everything was good, except the code. Now I have these 2 messages, Power Steering Assistance Reduced and 2-Wheel Drive Only - Traction Reduced.
The Code deals with the AWD system configuration and this hasn't been changed. The only thing that I can remember doing with the AWD system is a few weeks back I tightened up the front differential drain bolt because I thought it was leaking. Could this code be in relation to low fluid in the differential? I have no idea how to check other than going back under the car and emptying and refilling the system? I'm not sure if this will fix the problem but it is the only thing I can determine at this time.

Any help would be greatly appreciated.

Jaguar DTC U0001-82

Make: Jaguar

Code: U0001-82

Definition: High Speed CAN Communication Bus - Alive/sequence counter incorrect/not updated

Cause:

· All wheel drive control module is not configured correctly

· Invalid data received from another control module through the high-speed CAN bus (powertrain)