DTC U300A-62: Ignition Switch - Signal compare failure: Action

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

Check the security and integrity of the switched ignition supply circuit connectors. Rectify as required
Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the switched ignition supply circuit to the control module for faults, including intermittent high resistance. Repair circuit as required, clear DTC and retest