DTC U0404-41 Invalid Data Received From Gear Shift Control Module "A" - General checksum failure: Action

NOTE:

If other engine system Diagnostic Trouble Code(s) are set, perform the corrective actions for those Diagnostic Trouble Code(s) first and retest.
The FlexRay wiring harness must not be repaired by making a localised wiring repair. A new wiring harness should be installed.

Refer to the appropriate system wiring diagrams and check the transmission control switch power and ground circuits for open circuit, high resistance. Repair the wiring harness as necessary
Using the Jaguar Land Rover approved diagnostic equipment, perform a CAN network integrity test. Refer to the appropriate system wiring diagrams and check the high speed CAN bus (powertrain) circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary
Refer to the appropriate system wiring diagrams and check the FlexRay bus circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary
Using the Jaguar Land Rover approved diagnostic equipment, check the transmission control switch for related Diagnostic Trouble Code(s) and refer to the relevant DTC index