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Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336155) - 2020 - CRC - 5/6/19
48
Driving and Operating
2. Check the correct operation of
the default PTO preset
stationary mode to observe the
three idle up speeds. The PTO
function should be confirmed
before any wiring modifications
are done or any
reprogramming is attempted.
See your dealer if the default
presets are not functioning
properly.
3. The PTO indicator light will not
initially reflect the status of the
PTO load until the PTO load
relay is wired into the system.
The PTO load relay output is
enabled as a factory default.
When the PTO indicator light is
either blinking or on solid, the
PTO relay output will be
activated.
Preset Enable Conditions
–
Remote Operation
This requires programming with the
GM Service Tool and 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. 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 then elevate
engine rpm to PTO Standby
Speed and engage the PTO
load relay.
8. The Remote PTO Set switch
can now be used to accomplish
the PTO Set 1 and Set 2
engine speeds.
The accelerator pedal is
disabled when Remote PTO
operation is selected.
Preset Enable Conditions
–
Remote Operation In-Cab Enable
This requires programming with the
GM Service Tool and remote switch
panel provided by GM Upfitter.
Starting remote operation in-cab:
1. With the engine running, shift
the vehicle into P (Park),
release the brake pedal, and
set the parking brake.
2. Confirm that cruise control
is off.
3. Confirm the hood is closed.
4. Press and release the in-cab
PTO switch.
5. The horn will chirp, the PTO
load relay will engage, and the
engine will advance to the PTO
Standby Speed.
6. The Remote PTO Set switch
may be used to select PTO Set
1 and Set 2 engine speeds.
The accelerator pedal is disabled
when Remote PTO operation is
selected.
The operator may exit the vehicle.