Four-Wheel-Drive Light; Tow/Haul Mode Light; Hill Descent Control Light; Lane Departure Warning (Ldw) Light - GMC SIERRA 2020 Owner's Manual

If both the ABS warning light and
the brake system warning light are
on, ABS is not functioning and there
is a problem with the regular brakes.
See your dealer for service.
See Brake System Warning Light
0 139.

Four-Wheel-Drive Light

Auto Mode Shown, Other Modes
Similar
If equipped, the four-wheel-drive
light displays what mode the vehicle
is in. The light will show each mode:
2WD, 4HI, AUTO (all transfer
cases); 4LOW and N (two-speed
transfer case only).
The light will flash when a shift is in
progress. Once the shift is complete
the light will be steady.
If the light turns amber, there may
be a malfunction with the
four-wheel-drive system. See your
dealer.
See Four-Wheel Drive 0 227.

Tow/Haul Mode Light

For vehicles with the Tow/Haul
Mode feature, this light comes on
when the Tow/Haul Mode has been
activated.
See Tow/Haul Mode 0 227.

Hill Descent Control Light

Instruments and Controls
If equipped, the Hill Descent Control
light comes on when the system is
ready for use. When the light
flashes, the system is active.
See Hill Descent Control (HDC)
0 237.
Lane Departure Warning
(LDW) Light (2500/3500

Series)

If equipped, this light comes on
briefly while starting the vehicle. If it
does not come on, have the vehicle
serviced.
This light is green if LDW is on and
ready to operate.
This light changes to amber and
flashes to indicate that the lane
marking has been crossed without
using a turn signal in that direction.
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