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2021 Ford F-350 Owners Manual - Terrain Control



Terrain Control

WARNING: Hill descent control cannot control descent in all surface conditions and circumstances, such as ice or extremely steep grades. Hill descent control is a driver assist system and cannot substitute for good judgment by the driver. Failure to do so may result in loss of vehicle control, crash or serious injury.

WARNING: The system does not replace the parking brake. When you leave your vehicle, always apply the parking brake and shift the transmission into park (P) for automatic transmission or first gear for manual transmission.

Hill descent control allows the driver to set and maintain vehicle speed while descending steep grades in various surface conditions.

Hill descent control can maintain vehicle speeds on downhill grades between 2 mph (3 km/h) and 12 mph (20 km/h). Above 20 mph (32 km/h), the system remains armed, but descent speed cannot be set or maintained.

Hill descent control requires a cooling down interval after a period of sustained use. The amount of time that the feature can remain active before cooling varies with conditions. The system will provide a warning in the message center and a chime will sound when the system is about to disengage for cooling. At this time, manually apply the brakes as needed to maintain descent speed.

Press and release the hill descent button on the instrument panel. A light in the

cluster illuminates and a tone sounds when this feature is activated.

To increase descent speed, press the accelerator pedal until the desired speed is reached. To decrease descent speed, press the brake pedal until the desired speed is reached.

Whether accelerating or decelerating, once the desired descent speed is reached, remove your feet from the pedals and the chosen vehicle speed is maintained.

Note: Noise from the ABS pump motor may be observed during hill descent control operation. This is a normal characteristic of the ABS and should be no reason for concern.

• At speeds below 20 mph (32 km/h): When the hill descent control switch is pressed and hill descent control is active, the hill descent control telltale flashes.

• At speeds below 20 mph (32 km/h): When the hill descent control switch is pressed and conditions are not correct for hill descent activation, the hill descent control system is enabled and the hill descent control telltale is solid. A message displays in the information display.

• At speeds above 20 mph (32 km/h): When the hill descent control switch is pressed, the hill descent control system is enabled, the telltale in the cluster is not illuminated and a message is displayed in the information display.

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Refer to the information displays for additional hill descent control messages. See Information Messages (page 121).

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