GMC duramax diesel 2016 Supplement Manual page 80

The parking brake is applied.
The shift lever is moved out of
manual shift selection, M1,
M2, or M3.
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.
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 accumulate
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 clean or
regenerate the DPF. 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 be
displayed, and dealer service will be
required to return the vehicle to
normal, full power operation. To
prevent this from occurring,
frequently monitor the vehicle during
PTO operation, paying particular
attention to the CLEAN EXHAUST
FILTER SEE OWNER MANUAL
NOW DIC warning message. If the
DIC message is displayed during
PTO operation, see Diesel
Particulate Filter 0 38 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 Button
(In-Cab) or Remote PTO Set 1
Switch
Driving and Operating
SET : Press and hold the
accelerator to obtain the desired
engine speed, then press and
release the -/SET button on the
cruise control. The current engine
speed will be maintained. This
action can be repeated as desired
to a higher rpm value. The PTO set
speed cannot exceed 3100 rpm
(Mobile PTO only).
TAP-DOWN : Press and release the
-/SET button on the cruise control to
reduce the engine speed by
increments of 100 rpm. The tap
down engine speed increments can
be adjusted by the GM Service Tool.
The Service Tool can enable the
option for adjustment of tap down
engine speed increments through
the Radio Customization menu.
COAST : Press and hold the -/SET
button on the cruise control to
reduce the rpm at 150 rpm per
second until the desired engine
speed is reached or until the initial
PTO Standby Speed is reached.
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