Hill Descent Control Indicator
What it means
Shown as a car on a slope, green when the system is switched on, it usually flashes while the system is actively using the brakes to hold a slow, steady descent speed. It is an information light, not a warning, and the system normally works only below a set speed. Amber, or a message, means the system is unavailable or faulty, and behavior varies by make.
Symptoms4
- Steady green indicator after pressing the system button.
- Indicator flashing with light brake noise while descending, which is normal.
- The system does not work at higher speeds.
- Indicator amber, or the system will not switch on while the ABS light is lit.
Possible causes5
- System switched on and working on a slope, which is normal.
- Speed above the limit where the system operates.
- Brakes overheated after long use, so the system pauses.
- Faulty wheel speed sensor or ABS fault.
- Faulty system button or brake pedal switch (less common).
How to diagnose4
- Check the owner manual for the allowed speed and required gear for the system.
- Make sure speed is low and the transmission is in the right gear.
- If the system stopped after a long descent, wait for the brakes to cool.
- At the workshop: read ABS and stability codes and test the wheel speed sensors.
How to fix5
- Use the system for steep off-road or sandy descents at the allowed speed.
- Let the brakes cool before continuing a long descent.
- Replace a wheel speed sensor or repair its wiring if confirmed faulty.
- Replace the system button or brake switch if faulty.
- Clear codes and test the system on a safe slope.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The repair starts with checking and fixing a wire or button, and reaches the upper end for a wheel speed sensor plus diagnosis.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
Is brake noise normal while the system works?
Yes. The system applies and releases the brakes rapidly to hold speed, causing some noise and a slight pedal vibration.
Should I use it on paved mountain roads?
It is designed mainly for steep, rough descents. On paved mountain roads, use a low gear to reduce reliance on the brakes.
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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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