DTC U1A14-04: CAN Intialization Failure - System Internal Failures: 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: After updating the car configuration file, set the ignition to on and wait 30 seconds before clearing the DTCs.

Using the manufacturer approved diagnostic system, re-configure the transmission control switch with the latest level software
Using the manufacturer approved diagnostic system, clear the DTCs and retest. If the fault persists, install a new transmission control switch.