DTC P1707-74: Transfer Case Neutral or Park/Neutral Indication Circuit - Actuator slipping: Action

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, 2016 Land Rover Range Rover, 2015 Land Rover Range Rover, and 2014 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

Check the integrity of the emergency park release. Rectify as necessary
Check the integrity of the parklock mechanism. Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and road test the vehicle. Check the parklock mechanism by engaging and disengaging the parklock several times. Rectify as necessary
Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest. If the fault persists, install a new transmission control module