GMC Duramax Diesel 2015 Owner's Manual page 73

9-46 Driving and Operating
The stationary PTO mode will also
disengage if any of the following
conditions are detected by the
vehicle electronics:
Movement of the vehicle.
The parking brake is released.
The transmission is shifted from
P (Park) or N (Neutral) to
D (Drive) or R (Reverse).
The PTO load becomes
disengaged. (See service
manual.)
Cruise control is enabled.
Preset PTO Mode
Preset PTO can only be used when
the vehicle is not moving. This
mode provides both in-cab and
remote controls. The in-cab controls
are enabled as the factory preset.
The remote controls are disabled.
This factory preset configuration can
also be reprogrammed to enable the
remote controls, and disable the
in-cab PTO controls. See your
dealer for more information.
For in-cab PTO mode, the engine
speed is initially set to a stand-by
engine speed (900 rpm) by pressing
the PTO in-cab switch.
For remote PTO mode, with the
engine off, press and release the
PTO remote arm switch and within
5 seconds press and release the
PTO remote start/shutdown switch.
The engine speed is initially set to a
stand-by engine speed (900 rpm).
The stand-by engine speed can be
set to a higher speed by a service
technician.
Choose one of two factory presets
by pressing the SET (speed 1) or
+RES (speed 2) switches, or PTO
remote SET switch. Speed 1 and
Speed 2 are programmable by a
service technician from base engine
idle rpm to max PTO operation
speed (3100 rpm).
Speed 1: Pressing the /SET
position of the PTO switch
results in a preset speed of
1200 rpm.
Speed 2: Pressing the +/RES
position of the PTO switch
results in a preset speed of
1900 rpm.
Pressing and releasing the PTO
in-cab switch will return the engine
speed back to normal idle. The PTO
load relay is also disengaged. IN the
remote mode, pressing and
releasing the PTO remote start/
shutdown switch will disengage the
load and shut down the engine.
Maximum PTO Operating Speed: To
protect the PTO from over-speed,
the PTO system will disengage
when the engine speed exceeds
3100 rpm. The factory preset
maximum PTO operating speed is
2100 rpm. This can be
reprogrammed by a service
technician.
Variable PTO Mode
In this mode, the vehicle can be
programmed for stationary or mobile
operation.