RAM 1500 CLASSIC 2020 Owner's Manual page 125

Activating HDC
Once HDC is enabled it will activate automatically
if driven down a grade of sufficient magnitude. The
set speed for HDC is selectable by the driver, and
can be adjusted by using the gear shift +/-. The
following summarizes the HDC set speeds:
HDC Target Set Speeds
P = No set speed. HDC may be enabled but will

not activate.
R = 0.6 mph (1 km/h)

N = 1.2 mph (2 km/h)

D = 0.6 mph (1 km/h)

1st = 0.6 mph (1 km/h)

2nd = 1.2 mph (2 km/h)

3rd = 1.8 mph (3 km/h)

4th = 2.5 mph (4 km/h)

5th = 3.1 mph (5 km/h)

6th = 3.7 mph (6 km/h)

7th = 4.3 mph (7 km/h)

8th = 5.0 mph (8 km/h)

9th = 5.6 mph (9 km/h) – If Equipped

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 appro-
priately for the driver-selected set speed and corre-
sponding 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 (P)

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 4L Range

The park 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 illuminate

and remain on solid when HDC is enabled or
activated. This is the normal operating 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.
SAFETY 123
4