15
Hill Descent ControlF
Four-Wheel Drive
F
Tire Pressure Monitor
Hill Descent Control sets and maintains vehicle speed from 3–19 mph while descending a
steep incline in a forward or reverse gear.
1. Press the
Hill Descent Control button on the center of the instrument panel.
Vehicle speed must be below 37 mph to enable the system. The Hill Descent Control
symbol will illuminate on the instrument cluster.
2. Increase or decrease speed by applying the accelerator or brake pedal. The adjusted
speed becomes the new set speed. The
symbol flashes when the system is actively
applying the brakes to maintain vehicle speed.
See Driving and Operating in your Owner Manual.
The Low Tire Pressure warning light on the instrument cluster illuminates when one
or more of the vehicle’s tires is significantly underinflated. Fill the tires to the proper tire
pressures listed on the Tire and Loading Information label, located below the driver’s door
latch. Current tire pressures can be viewed in the Driver Information Center.
Use the electronic four-wheel drive transfer case knob on the left side of the instrument
panel to shift into and out of four-wheel drive. The indicator light on the knob flashes
while the transfer case shifts and remains on when the shift is complete.
2
Two-Wheel Drive High
– Use for most streets and highways. Shift
into this mode at any speed except when shifting from 4.
AUTO Auto Four-Wheel Drive High – Use when traction conditions
vary. Shift into this mode at any speed except when shifting from 4
.
4
Four-Wheel Drive High – Use when extra traction is needed or in
most off-road driving. Shift into this mode at any speed up to 75 mph
except when shifting from 4
.
4
Four-Wheel Drive Low – Use when driving off-road in deep sand, mud or snow or on
steep hills. Shift into or out of this mode when the vehicle is stopped or moving less than
3 mph with the transmission in Neutral. Shift the transmission into gear when the indica
-tor light stops flashing.
N Neutral – Use when towing the vehicle.
See Driving and Operating in your Owner Manual.
F Optional equipment
Diesel Exhaust Brake (Diesel Models Only)
The engine exhaust brake enhances the vehicle brake system by using engine braking and
automatically downshifting the transmission, depending on the length of time the brakes
are applied, to help slow the vehicle on downhill grades.
Press the Diesel Exhaust Brake button on the center of the instrument panel to
turn the system on or off.
See your Duramax Diesel Owner Manual.
See Vehicle Care in your Owner Manual.
