DTC P0634-68: Control Module Internal Temperature A Too High - Event information: Action

WARNING: This page is about a different car, the 2018 Jaguar XF, 2017 Jaguar XF, and 2016 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

This DTC is set when the transfer case control module internal temperature exceeds the maximum threshold.
This DTC may be induced by prolonged driving on a poor traction surface.

Check the transfer case control module cooling airflow for obstructions (mud packing, etc). Rectify as necessary
Check the exhaust system for damage. Rectify as necessary
Allow the system temperature to return to normal. Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and perform routine - On Demand Self Test. If the fault persists, install a new transfer case control module