Chevrolet GMC Duramax 2023 Manual page 39

38 Driving and Operating
Press the PTO in-cab switch. The PTO
clutch disengages and the engine returns
to base idle. The PTO indicator light will
turn off, indicating the PTO clutch is
disengaged and the stored set speed has
been cleared from memory.
Mobile Mode will also disengage if:
PTO feedback input is lost. The engine
speed is returned to the PTO Standby
speed setting and the load is still
engaged. This is configurable with the GM
Service Tool.
Vehicle Speed exceeds Max Vehicle Speed.
Factory default setting = 94 km/h
(58 mph). PTO will re-engage and advance
to the last engine speed stored in
memory when both the vehicle speed is
reduced below 94 km/h (58 mph) and the
engine speed ramps down below the
maximum PTO engagement speed
(1500 rpm factory default setting).
Engine Speed exceeds Max Engine Speed
for more than 15 seconds. Factory default
setting = 2100 rpm.
on the cruise control is pressed.
The parking brake is applied.
Maximum engine torque limit has been
reached.
Resume memory speed is cleared for the
above actions.
Although the PTO system attempts to limit
accelerator and PTO switch inputs to comply
with maximum speed and/or rpm
parameters, some vehicle operating
conditions such as downhill acceleration can
cause the vehicle speed or engine rpm to
exceed these limits. In those cases, the PTO
system may disengage.
Operator Selectable In-Cab Mode (OSIM)
To disable OSIM Stationary PTO:
Press and release the PTO in-cab switch.
To disable OSIM Mobile PTO:
Press and release the PTO in-cab switch.
Prolonged or Extended PTO Operation
When operating the vehicle in stationary
PTO mode, the Diesel Particulate Filter (DPF)
will continue to filter the exhaust and build
up soot. The engine control system,
depending on the speed and load being
applied by the PTO, may not be able to
generate enough energy or adequate heat
needed to automatically clean or regenerate
the DPF. If manual regeneration is not
initiated, continued operation under
conditions that do not allow effective
regeneration or cleaning will eventually plug
the DPF and result in reduced power. The
ENGINE POWER IS REDUCED Driver
Information Center (DIC) message and
malfunction indicator lamp will display. See
your dealer for service. To prevent this,
frequently monitor the vehicle during
stationary PTO operation, and pay attention
to horn chirps and/or the CLEAN EXHAUST
FILTER SEE OWNER MANUAL NOW DIC
warning messages. If the DIC message is
displayed during PTO operation, see Diesel
Particulate Filter 0 16 for information on
how to clean or regenerate the DPF.
PTO Operational Speed Control
Variable PTO operational speed control
provides the following functions:
Cruise Control SET (In-Cab) or Remote PTO
Set 1 Switch
SET : When PTO is engaged press and hold
the accelerator to obtain the desired engine
speed, then press and release SET on the
cruise control. The current engine speed will
be maintained. This action can be repeated
as desired to capture a higher rpm value.
The PTO set speed cannot exceed 2500 rpm,
or the PTO Max Engine Speed configured.