Chevrolet Silverado 4500HD 2022 Owner's Manual page 261

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.
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.
Driving and Operating
Mobile Mode
To disengage PTO:
Press the brake pedal. The PTO system
releases control of engine speed, but the
PTO load relay remains engaged. The
engine will return to base idle unless the
accelerator pedal is pressed. The PTO load
relay remains engaged. The PTO indicator
light will blink slowly indicating that a
PTO set speed is still stored in memory.
Upon releasing the brake, the factory
default programming is for the engine
speed to remain at curb idle awaiting an
input from +RES on the cruise control to
restore engine rpm to the last PTO set
speed. The system can also be
programmed to return engine rpm to the
PTO Standby Speed setting.
Press on the cruise control. The engine
returns to base idle, but the PTO load
relay remains engaged. The PTO indicator
light will blink slowly indicating that a
PTO set speed is still stored in memory.
Pressing +RES on the cruise control will
restore engine rpm to the last PTO set
speed.
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