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Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336155) - 2020 - CRC - 5/6/19
50
Driving and Operating
.
The PTO Control setting on the
Service Tool must be
programmed to Remote PTO
Mode Switch before the remote
switches can be used.
.
The PTO relay is programmed to
be enabled in the factory default
configuration.
.
Refer to the service manual or
go to the GM Upfitter Integration
website www.gmupfitter.com for
details, advanced programming
features, and usage with a
removable pendant.
Variable PTO
Variable Enable Conditions
–
In-Cab Operation
To enable PTO:
1. With the engine running, shift
the vehicle into P (Park) and
set the parking brake. Do not
press the brake pedal.
2. Press and release the PTO
in-cab switch below the climate
controls in the center stack.
The PTO indicator light will
blink rapidly until the PTO load
relay becomes engaged and
will then be on steady. The
engine will advance to the PTO
Standby Speed.
3. Once PTO Standby Speed is
reached, SET
−
and +RES on
the cruise control can be used
to tap up and tap down the
engine speed. Factory setting
for the tap step is 100 rpm and
the setting for the ramp rate is
150 rpm/sec. The GM Service
Tool can enable the capability
to change the default value for
tap step via the Radio
Customization menu. The
default values for both tap step
and ramp rate can be changed
with the GM Service Tool. The
accelerator pedal is disabled,
and cannot be used to control
PTO engine speed.
Variable Enable Conditions
–
Remote Operation
This requires programming with the
GM Service Tool and the
appropriate remote switch panel
provided by GM Upfitter.
1. Confirm that cruise control
is off.
2. Set the parking brake and shift
the transmission into P (Park).
3. Turn the engine off. Remove or
place the key in the ignition off
position. Lock the vehicle,
if desired.
4. The hood must be closed.
5. From outside the vehicle, press
and release the Remote PTO
Arm switch.
6. Within five seconds, open and
close the Remote PTO Engine
Start/Shutdown switch.
7. The horn will chirp, and then
engine starting will be
automatically initiated. The
PTO system will then elevate
engine rpm to PTO Standby
Speed and engage the PTO
load relay.