GMC Chevrolet Silverado 2500HD 2021 Owner's Manual page 257

256 Driving and Operating
A compatible trailer profile is not
configured or a non-compatible trailer
profile is selected.
The vehicle is in R (Reverse).
The trailer is not connected.
The accessory rear trailer camera is not
connected or connected to the incorrect
input.
The preview may not be provided or the
wrong preview may be provided if:
The accessory cameras are not recognized.
Ensure that the accessory camera(s) are
connected and power cycle the vehicle.
The accessory trailer cameras are
swapped at the hitch connector. Ensure
that the accessory camera(s) are
connected to the correct input.
The accessory trailer camera(s) are
connected to the correct camera input.
The accessory trailer camera(s) are not
installed according to the installation
instructions.
A feature may be unavailable or not
activating as expected if:
The customization is disabled. Check the
customization settings where applicable.
The accessory trailer cameras are
swapped at the hitch connector. Ensure
that the accessory camera(s) are
connected to the correct camera input.
A view may switch automatically if:
The vehicle is shifted to another gear.
Park Assist
With Front and Rear Park Assist, as the
vehicle moves at speeds of less than 8 km/h
(5 mph) the sensors on the bumpers may
detect objects up to 1.2 m (4 ft) in front and
2.5 m (8 ft) behind the vehicle within a zone
25 cm (10 in) high off the ground and below
bumper level. These detection distances may
be shorter during warmer or humid weather.
Blocked sensors will not detect objects and
can also cause false detections. Keep the
sensors clean of mud, dirt, snow, ice, and
slush; and clean sensors after a car wash in
freezing temperatures.
Warning
The Park Assist system does not detect
children, pedestrians, bicyclists, animals,
or objects located below the bumper or
that are too close or too far from the
vehicle. It is not available at speeds
Warning (Continued)
greater than 8 km/h (5 mph). To prevent
injury, death, or vehicle damage, even
with Park Assist, always check the area
around the vehicle and check all mirrors
before moving forward or backing.
The instrument cluster may have a Park
Assist display with bars that show distance
to object and object location information
for the Front and Rear Park Assist system.
As the object gets closer, more bars light up
and the bars change color from yellow to
amber to red.
When an object is first detected in the rear,
one beep will be heard from the rear,
or both sides of the Safety Alert Seat will
pulse two times. When an object is very
close <0.4 m (1.5 ft) in the vehicle rear or
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