U0404-41: Invalid Data Received from Gear Shift Control Module A - General checksum 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.

Using the Jaguar Land Rover approved diagnostic equipment, complete a CAN network integrity test. Refer to applicable SYSTEM WIRING DIAGRAM(S) and check CAN circuits if required. Repair harness as required
Check engine control module for additional DTCs and refer to relevant DTC index. Rectify these first
Check transmission control switch for related DTCs and refer to relevant DTC index
Refer to the applicable SYSTEM WIRING DIAGRAM(S) and check the power and ground connections to the transmission control switch
Using the Jaguar Land Rover approved diagnostic equipment, clear all stored DTCs using the `Diagnosis Menu' tab and retest