Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Hill Descent Control
Hill Descent Control (HDC) is included on vehicles equipped with the Off-Road Group (sales code AWL). It provides downhill assistance at a safe and controlled rate of speed without requiring the driver to touch the brakes or press a button. This feature operates in low and reverse gears. By means of electronics it replaces the gear reduction and engine braking that a traditional mechanical low-range transfer case provides. For ease of operation, HDC is activated and deactivated automatically according to changes in topography using grade sensing.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.