2021 CHEVROLET COLORADO horn

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CHEVROLET COLORADO 2021 Duramax Diesel Supplement Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Driving and Operating 39
3. Press and release the PTO in-cab switchbelow the climate c

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Driving and Operating 39
3. Press and release the PTO in-cab switchbelow 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.
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.

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Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
40 Driving and Operating
5. The horn will chirp, the PTO load relaywill 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.
{Warning
If the key is in the ignition during
Remote PTO operation, the vehicle can be
shifted out of P (Park) by an
unauthorized operator. Even though PTO
will be disengaged, depending on PTO
Upfitter application, personal injury or
property damage may result from vehicle
movement. The operator must ensure
that the vehicle is secured against
unauthorized access during Remote PTO
operation.
Remote PTO operation may be ended by
pressing the brake pedal at which time the
PTO load relay disengages and the engine returns to base idle speed. The operator
may drive the vehicle after releasing the
parking brake.
Preset Enable Conditions
–Operator
Selectable In-Cab Mode (OSIM)
This requires programming with the GM
Service Tool and requires pairing OSIM
stationary preset with OSIM mobile mode.
If OSIM pairing has been configured, initiate
OSIM preset operation:
1. With the engine running, shift the vehicle into P (Park) and 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 in-cab PTO switch. The PTO indicator light will blink slowly.
5. Within 10 seconds, press and release SET −on the cruise control.
6. The PTO indicator light will change to solid when the PTO load relay becomes
engaged. The engine speed will advance
to the PTO Standby Speed. Press and
release SET− on the cruise control to
select the PTO Set 1 speed. Press and
release +RES on the cruise control to
select the PTO Set 2 speed.
.The PTO load relay engages immediately
when the PTO operation is initiated by
the switch input. The transmission torque
converter is unlocked. The torque
converter will lock upon reaching stable
PTO Standby Speed (default = 900 rpm)
so maximum power is available.
.The first elevated engine speed, PTO
Standby Speed, is not intended as a
working speed but as a verification that
the system is active and ready to go to a
working speed. This speed can be
modified to a working speed with the GM
Service Tool. The upper limit for PTO
Standby Speed is 1500 rpm.
.The remote switches and relay
connections are made at the PTO Upfitter
Connector located on the chassis frame
behind the cab.
.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.

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Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Driving and Operating 41
.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. 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 load relay will engage, and the engine will advance
to the PTO Standby Speed.
The operator may exit the vehicle.
{Warning
If the key is in the ignition during
Remote PTO operation, the vehicle can be
shifted out of P (Park) by an
unauthorized operator. Even though PTO
will be disengaged, depending on PTO
Upfitter application, personal injury or
property damage may result from vehicle
movement. The operator must ensure (Continued)

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Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
44 Driving and Operating
remain at curb idle. A press and release
of +RES on the cruise control will restore
engine rpm to the last PTO set speed. The
PTO system can also be programmed to
return engine rpm to the PTO Standby
Speed setting.
.Press*on the cruise control. The engine
returns to base idle, but the PTO load
relay remains engaged. The PTO indicator
light will blink slowly indicating that a
PTO set speed is still stored in memory.
Activating +RES on the cruise control will
restore engine rpm to the last PTO set
speed.
.Press and release the PTO in-cab switch.
The PTO load relay disengages and the
engine returns to base idle. The PTO
indicator light will turn off, indicating the
PTO load relay is disengaged and the
stored set speed has been cleared from
memory.
Stationary Modes (Preset or Variable) –
Remote Control
To disengage PTO:
.Open the Remote PTO Engine Start/
Shutdown switch. Load relay disengages
and the engine will stop.
.If equipped, press the PTO Emergency
Stop switch. Load relay disengages and
the engine will stop. Refer to the bulletins
in the GM Upfitter Integration website
www.gmupfitter.com for the Power
Take-Off (PTO) operating description and
application guide.
.With the key in the ignition and rotated
to the RUN position, press the brake
pedal. The PTO load relay disengages and
the engine returns to base idle speed. The
operator may drive the vehicle.
Stationary Modes will also disengage if:
.Vehicle movement is detected.
.The parking brake is released.
.The transmission is shifted out of
P (Park).
.The ignition is cycled from RUN to OFF.
.The PTO feedback signal is lost indicating
the load is disengaged if used. See
www.gmupfitter.com.
.Cruise control becomes enabled.
.Timed auto-engine shutdown: This feature
will shut down the engine automatically
after a predefined time. PTO must be
operational for this function to be active.
.Engine shutdown based on critical engine
or PTO system fault conditions: This
feature will shut down the engine when
PTO is operating if a critical engine
condition such as low oil, low oil pressure,
hot engine, hot transmission, low fuel,
or Diesel Particulate Filter regeneration is
detected by the vehicle system. If PTO
operation is continued when critical
engine conditions are present, a horn
chirp warning will occur after 30–
60 seconds. The engine will shut down
two minutes after the horn warning. The
engine can be restarted with the ignition
key or with the Remote PTO engine start
controls. The horn warning and engine
shutdown will again occur if the critical
engine condition is still present.
Resume memory speed is cleared for the
above actions.
When Remote PTO engine starting has been
initialized with the ignition key in the RUN
position, the shift lever will remain locked if
the brake pedal is pressed and a shift from
P (Park) is attempted while the engine is
running and PTO is active (standby mode).
A shift out of P (Park) will not be allowed
until one of the following actions is taken
by the vehicle operator:

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Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
46 Driving and Operating
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 automatically clean or regenerate
the DPF. If manual regeneration is not
initiated, 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 stationary PTO
operation, paying particular attention to any
horn chirps and/or the CLEAN EXHAUST
FILTER SEE OWNER MANUAL NOW DIC
warning messages. If the DIC message is
displayed during PTO operation, seeDiesel
Particulate Filter 019 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− (In-Cab) or Remote PTO
Set 1 Switch
SET : Press and hold the accelerator to
obtain the desired engine speed, then press
and release SET− on the cruise control. The
current engine speed will be maintained.
This action can be repeated as desired to
capture a higher rpm value. The PTO set
speed cannot exceed 2900 rpm.
TAP DOWN : Press and release SET− 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 SET− on the cruise
control to reduce the rpm at 150 rpm/sec
until the desired engine speed is reached or
until the initial PTO Standby Speed is
reached. In-Cab Cruise Control +RES or Remote PTO
Set 2 Switch
RESUME :
After a PTO set speed has been
met, a Resume Speed message is retained
after an application of the brake pedal.
Engine speed will reduce to basic idle speed.
The PTO indicator light will blink slowly
indicating the previous PTO set speed has
been retained in memory. Press and release
+RES on the cruise control to resume the
previous PTO set speed.
TAP UP : Press and release +RES on the
cruise control to increase the engine speed
by increments of 100 rpm (factory preset
value). The tap up engine speed increments
can be adjusted by the GM Service Tool. The
Service Tool can enable the option for
adjustment of tap up engine speed
increments through the Radio
Customization menu.
ACCEL : Press and hold +RES on the cruise
control to increase the rpm by 150 rpm/sec
until the desired engine speed is reached or
until the maximum allowable PTO set speed
is reached. Alternatively, the engine speed
acceleration can be adjusted through the
Radio Customization menu.

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