Chevrolet GMC Duramax 2023 Manual page 35

34 Driving and Operating
engine speed. Factory setting for the tap
step is 100 rpm and the setting for the
ramp rate is 148 rpm/sec. The GM
Service Tool can enable changing the
default value for tap step through
vehicle personalization. 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 cruise control is off.
2. Set the parking brake and shift the
transmission into P (Park).
3. Turn the ignition off or remove the
ignition key, if equipped.
4. Confirm the hood is 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 engage the PTO
clutch and then elevate engine rpm to
PTO Standby Speed.
Warning
If the key is in the ignition (Key Access)
or the RKE transmitter is in the vehicle
(Keyless Access) during Remote PTO
operation, the vehicle can be shifted out
of P (Park). Even though PTO will be
disengaged, depending on PTO Upfitter
application, personal injury or property
damage may result from vehicle
movement. Always remove the key from
the ignition or the RKE transmitter from
the vehicle before operating Remote PTO,
unless the Remote Operation In-Cab
Enable feature is used.
Variable Enable Conditions Remote
Operation In-Cab Enable Starting Remote
Operation from In-Cab
This requires programming with the GM
Service Tool and remote switch panel
provided by GM Upfitter.
1. With the engine running, shift the
vehicle into P (Park), release the brake
pedal, and set the parking brake.
2. Confirm cruise control is off.
3. Confirm the hood is closed.
4. Press and release the PTO in-cab switch.
5. The horn will chirp, the PTO clutch will
engage, and the engine will advance to
the PTO Standby Speed.
The vehicle may be exited.
The accelerator pedal is disabled when
Remote PTO operation is selected.
The desired engine operating speed can
now be reached. Switches or
potentiometer engine rpm controls are
available, depending on which one was
installed.
Switches The Remote PTO Set and
Resume switches can be used to tap up
and tap down to the desired engine
speed.
Potentiometer A Remote PTO
Throttle Potentiometer can be used as
a continuous variable throttle control
to dial in the desired engine speed.