GMC 2012 Sierra Denali Owner's Manual page 293

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The URPA system can be turned
on and off using the rear park aid
disable button located next to
the radio.
The indicator light comes on when
the system is disabled and turns off
when the system is on.
When the system is off, PARK
ASSIST OFF displays on the Driver
Information Center (DIC). The
message disappears after a short
period of time.
URPA defaults to the on setting
each time the vehicle is started.
The following messages may be
displayed on the DIC:
message occurs, take the vehicle to
your dealer to repair the system.
This
message can occur under the
following conditions:
The ultrasonic sensors are not
clean. Keep the vehicle's rear
bumper free of mud, dirt, snow,
ice, and slush. For cleaning
instructions, see
.
The park assist sensors are
covered by frost or ice. Frost or
ice can form around and behind
the sensors and may not always
be seen; this can occur after
washing the vehicle in cold
weather. The message may not
clear until the frost or ice has
melted.
A trailer was attached to the
vehicle, or an object was
hanging out of the tailgate during
the last drive cycle. Once the
object is removed and the
tailgate is raised, URPA will
If this
return to normal operation.
A tow bar is attached to
the vehicle.
The bumper is damaged. Take
the vehicle to your dealer to
repair the system.
Other conditions, such as
vibrations from a jackhammer or
the compression of air brakes on
a very large truck, are affecting
system performance.

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