Hill Descent Control (HDC)

The Hill Descent Control (HDC) system assists in managing speed when driving downhill, particularly on steep inclines. It allows the driver to maintain a controlled descent without constant use of the brake pedal.

Activating the HDC System

The HDC system can be activated when the vehicle's speed is below 80 km/h (50 mph). It is compatible with the following drive modes: D (Forward), R (Reverse), and manual gear selection via CommandShift™™ in low-range gears (1st gear) and in all gears in low-range mode. When in D mode, the vehicle automatically selects the most appropriate gear.

Note: The HDC system may activate automatically with certain Terrain Response system programs.

To engage HDC, press and release the HDC on/off button (1). If the HDC indicator light flashes, the system is active but not currently controlling speed, likely due to conditions like excessive speed.

If HDC disengages during operation, the indicator will flash during a gradual speed reduction, allowing the vehicle to slow down smoothly. The system automatically disengages if the vehicle speed exceeds 80 km/h (50 mph), and the HDC indicator will turn off. HDC will also automatically deactivate if the ignition is switched off for more than six hours.

Operating the HDC System

With HDC engaged, speed can be adjusted using the cruise control buttons on the steering wheel:

Press and hold the '+' button (2) to increase speed until the desired speed is reached.
Press and hold the '-' button (3) to decrease speed until the desired speed is reached.

Once a button is released, the selected speed will be maintained. To increase or decrease speed incrementally, press the '+' or '-' button briefly. Each press adjusts the speed by 0.5 km/h (0.3 mph).

The accelerator pedal can also be used to increase speed, up to the maximum limit for the current gear. A minimum speed is set for each gear.

Note: On gentle slopes, pressing the '+' button may not increase speed. Increased driving force is typically only achieved on steeper descents.

Pressing the brake pedal will disengage HDC, and the brakes will operate normally. Upon releasing the brake pedal, HDC will resume control of the vehicle's descent. If HDC is disengaged by braking on a downhill slope, its effect on speed will gradually reduce to prevent abrupt changes and maintain control. HDC will reactivate upon re-engagement if still needed, maintaining the speed at which the brake pedal was released.

Hill Start Assist (GRC)

When HDC is active and the vehicle is stopped on a hill using the brake pedal, the Hill Start Assist (GRC) system engages (except in specific Terrain Response modes like Sand). When the brake pedal is released while moving uphill, GRC automatically holds the brakes momentarily, allowing for a smooth start. Similarly, when moving downhill, GRC provides a controlled release of the brakes for a smooth HDC engagement.

GRC operates automatically during forward and reverse starts and does not require driver intervention.

Driving on Steep Inclines

When HDC is active and driving up a steep incline, the driver retains full control of the vehicle. If HDC is disengaged, the vehicle's maximum speed will be limited to ensure more precise control during the ascent.

Warning Messages

Caution: Do not attempt to descend steep slopes if the HDC system is not functioning or if warning messages are displayed.

Brake Temperature

Under demanding conditions, the HDC system may cause brake temperatures to exceed normal limits. In such cases, the information display will show the message 'HDC TEMPORARILY UNAVAILABLE'. The system's operation will gradually reduce, and it will become temporarily inactive. Once the brakes have cooled down, the message will disappear (or the indicator light will turn off), and HDC will resume operation if required.

System Malfunction

If a system malfunction is detected, the information display will show the message 'HDC UNAVAILABLE SYSTEM ERROR'. If this occurs while HDC is active, its effect on speed will gradually decrease. If a malfunction is detected, it is recommended to contact a Land Rover dealer or authorized service center as soon as possible.

	Hill Descent Control (HDC) System Operation and Troubleshooting A guide to understanding and operating the Hill Descent Control (HDC) system, including activation, speed adjustment, and troubleshooting common issues like brake temperature and system malfunctions. Information provided for Land Rover vehicles.
	Hill Descent Control (HDC) System Explained Learn about the Hill Descent Control (HDC) system, its functions, operation, and important warnings for safe driving on slopes. Includes information on Gradient Release Control (GRC).
	Land Rover Hill Descent Control (HDC) Operation and Troubleshooting Comprehensive guide to Land Rover's Hill Descent Control (HDC) system, explaining its principle of operation, how to use it in various transmission types (manual and automatic), and troubleshooting common faults and messages. Covers speed limitations, gear selection, and adjustments using steering wheel controls.
	Land Rover Hill Descent Control (HDC) System Guide A comprehensive guide to understanding and operating the Hill Descent Control (HDC) system in Land Rover vehicles, including activation, speed adjustment, and troubleshooting.
	Land Rover Hill Descent Control (HDC) System Guide A comprehensive guide to understanding and using the Hill Descent Control (HDC) system in Land Rover vehicles, covering activation, speed adjustment, and troubleshooting.
	Hill Descent Control (HDC) System Operation and Features Detailed guide on the operation, activation, and features of the Hill Descent Control (HDC) system, including speed adjustments, transmission compatibility, and troubleshooting.
	Land Rover Hill Descent Control (HDC) System Overview An overview of the Land Rover Hill Descent Control (HDC) system, explaining its functions, operation, and limitations. Includes information on the Hill Launch Assist (HLA) system and brake temperature management.
	Hill Descent Control (HDC) System Operation Guide This document outlines the operation and features of the Hill Descent Control (HDC) system, providing instructions on activation, speed adjustment, and system behavior under various conditions. It covers manual and automatic transmission usage, as well as specific scenarios like driving uphill and potential system warnings.