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Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336155) - 2020 - CRC - 5/6/19
Driving and Operating
47
must select one of the two
modes within the pre-configured
pairing. If an OSIM mode is not
selected, PTO will not operate.
OSIM modes of operation are:
‐
Stationary
For stationary mode, the
configuration may be
stationary preset or stationary
variable.
‐
Mobile
For mobile mode, the
configuration is variable only.
Selection between OSIM
pairings is not available.
Remote modes are not
available.
The factory default programming
enables in-cab control. For
stationary modes, a GM Service
Tool can reprogram the system to
allow for remote control and disable
the in-cab control.
All PTO modes provide for engine
rpm control and PTO load relay
control.
All PTO modes provide for safety
interlocks for PTO load
disengagement.
Remote PTO modes provide for
remote engine starting and
shutdown.
Stationary in-cab and Remote PTO
modes provide for engine shutdown
due to critical engine conditions, as
well as a timed engine shutdown
feature.
Preset PTO
Preset 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. Confirm that cruise control
is off.
3. 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.
4. Once the PTO Standby Speed
is reached, use SET
−
and
+RES on the cruise control to
reach the Set 1 or Set 2 PTO
engine speeds.
The accelerator pedal is
disabled and cannot be used to
override the PTO preset
speeds.
Factory Default PTO Engine
Speeds
Standby
900 rpm
Set 1 (SET
−
)
1200 rpm
Set 2 (+RES)
1900 rpm
The first time a vehicle is used
for PTO:
1. The PTO Control setting on the
GM Service Tool is
programmed to Interior Mode
PTO Switch.