GMC CHEVROLET Silverado 6500HD 2019 Owner's Manual page 280

Stationary Modes will also
disengage if:
Vehicle movement is detected.
The parking brake is released.
The transmission is shifted out
of P (Park).
The ignition is cycled from on
to off.
The PTO feedback signal is lost
indicating the load is disengaged
if used. See
www.gmupfitter.com.
Cruise control becomes enabled.
There is a timed auto-engine
shutdown: This feature will shut
down the engine automatically
after a predefined time. PTO
must be operational for this
function to be active. This
feature is not available for
emergency vehicle applications.
There is an engine shutdown
based on critical engine or PTO
system fault conditions: This
feature will shut down the engine
when PTO is operating if a
critical engine condition such as
low oil, low oil pressure, hot
engine, hot transmission, low
fuel, or Diesel Particulate Filter
regeneration is detected by the
vehicle system. If PTO operation
is continued when critical engine
conditions are present, a horn
chirp warning will occur after 30
60 seconds. The engine will shut
down two minutes after the horn
warning. The engine can be
restarted with the ignition key or
with the Remote PTO engine
start controls. The horn warning
and engine shutdown will again
occur if the critical engine
condition is still present. This
feature is not available for
emergency vehicle applications.
Driving and Operating
Resume memory speed is cleared
for the above actions.
When Remote PTO engine starting
has been initialized with the ignition
key in the RUN position, the shift
lever will remain locked if the brake
pedal is pressed and a shift from
P (Park) is attempted while the
engine is running and PTO is active
(standby mode). A shift out of
P (Park) will not be allowed until one
of the following actions is taken by
the vehicle operator:
Press the Remote PTO Engine
Start/Shutdown switch.
Press the PTO in-cab switch
(only if the PTO in-cab Remote
Start/Stop feature is enabled).
This requires programming with
the GM Service Tool.
Press on the cruise control.
Release the parking brake.
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