Possible Causes

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.

Low battery supply
Left electric park brake actuator, brake disc or brake pads not installed correctly
Left electric park brake actuator circuit short circuit to ground, short circuit to power, open circuit, high resistance
Anti-lock brake system control module power or ground circuit open circuit, high resistance
Left electric park brake actuator mechanical failure