RAM 2500 2021, Owner'S Manual

Page: 313 / 504

SAFETY 311
NOTE:
During HDC the +/- shifter input is used for HDC
target speed selection, but will not affect the
gear chosen by the transmission. When actively
controlling HDC the transmission will shift
appropriately for the driver-selected set speed
and corresponding driving conditions.
Driver Override
The driver may override HDC activation with
throttle or brake application at any time.
Deactivating HDC
HDC will be deactivated but remain available if
any of the following conditions occur:

Driver overrides HDC set speed with throttle
or brake application.

Vehicle speed exceeds 20 mph (32 km/h)
but remains below 40 mph (64 km/h).

Vehicle is on a downhill grade of insufficient
magnitude, is on level ground, or is on an
uphill grade.

Vehicle is shifted to PARK.
Disabling HDC
HDC will be deactivated and disabled if any of
the following conditions occur:

The driver pushes the HDC switch.

The driveline is shifted out of 4WD Low.

The parking brake is applied.

The driver door opens.

The vehicle is driven greater than 20 mph
(32 km/h) for greater than 70 seconds.

The vehicle is driven greater than 40 mph
(64 km/h) (HDC exits immediately).

HDC detects excessive brake temperature.
Feedback To The Driver
The instrument cluster has an HDC icon and the
HDC switch has an LED icon, which offers
feedback to the driver about the state HDC is in.

The cluster icon and switch lamp will illumi -
nate and remain on solid when HDC is
enabled or activated. This is the normal oper -
ating condition for HDC.

The cluster icon and switch lamp will flash for
several seconds then extinguish when the
driver pushes the HDC switch but enable
conditions are not met.

The cluster icon and switch lamp will flash for
several seconds then extinguish when HDC
disables due to excess speed.

The cluster icon and switch lamp will flash
when HDC deactivates due to overheated
brakes. The flashing will stop and HDC will
activate again once the brakes have cooled
sufficiently.
Hill Start Assist (HSA)
HSA is designed to mitigate roll back from a
complete stop while on an incline. If the driver
releases the brake while stopped on an incline,
HSA will continue to hold the brake pressure for
WARNING!
HDC is only intended to assist the driver in
controlling vehicle speed when descending
hills. The driver must remain attentive to the
driving conditions and is responsible for
maintaining a safe vehicle speed.
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