Symptom Chart

WARNING: This page is about a different car, the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, and 2016 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM	POSSIBLE CAUSE	ACTION
Speed control inhibited or disabled	Power or ground supply to adaptive speed control module Steering wheel speed control switch/circuits Throttle sensors Brake switch ABS fault Speed control sensor obstructed	Check for DTCs that could be caused by power or ground failure to the module and refer to DTC index Check for sticking, jammed and broken speed control switches. Refer to appropriate system wiring diagram and check speed control switch circuits for short circuit, open circuit, high resistance Check for engine throttle position sensor DTCs and refer to the relevant DTC index. For throttle position sensor tests Refer to: ELECTRONIC ENGINE CONTROLS Check for correct installation and adjustment of brake switch. Refer to appropriate system wiring diagram and check brake switch circuits for short circuit, open circuit, high resistance Check ABS system for related DTCs and refer to the relevant DTC index Make sure there is no snow, ice or other obstruction on the fascia in front of the speed control radar. Adaptive cruise control will not engage until the radar has detected valid target(s)
Unable to regulate/adjust vehicle speed	Steering wheel switch malfunction	Check for sticking, jammed and broken speed control switches. Refer to appropriate system wiring diagram and check speed control switch circuits for short circuit, open circuit, high resistance
Unable to cancel speed control from steering wheel	Steering wheel switch malfunction	Check for sticking, jammed and broken speed control switches. Refer to appropriate system wiring diagram and check speed control switch circuits for short circuit, open circuit, high resistance
Unable to cancel speed control from brake pedal	Brake switch malfunction	Check for correct installation and adjustment of brake switch. Refer to appropriate system wiring diagram and check brake switch circuits for short, open circuit, high resistance

For a list of DTCs that could be logged on this vehicle, please refer to DIAGNOSTIC TROUBLE CODE (DTC) INDEX - DTC: ADAPTIVE SPEED CONTROL MODULE