cruise control 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
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.

Chevrolet/GMC 2.8L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-14465442) - 2021 - CRC - 2/3/20
Driving and Operating 51
.PTO: REDUCE VEHICLE SPEED
.PTO: REDUCE ENGINE SPEED
.PTO: DISENGAGE CRUISE CONTROL
.PTO: ACCELERATION UPON BRAKE RELEASE
.PTO: SERVICE PTO
.PTO: SHIFT TO M1, M2 OR M3 (Mobile
mode only)
.Action Required Cleaning Exhaust Filter
Continue Driving (DPF only)
.Action Required Cleaning Exhaust Filter
Must Continue Driving (DPF only)
.Exhaust Filter Cleaning Available Go to
Options Menu (DPF only)
In addition, the PTO indicator light will light
when all conditions required to engage PTO
have not been met. When enabling PTO, the
PTO indicator light will turn on, then turn
off after one second. Under normal
operating conditions, the PTO indicator light
will remain on throughout the PTO
operating cycle.
Additional in-vehicle PTO module
information can be accessed by the service
technician to aid in troubleshooting. Also see
the service manual for more information. The GM service technician can access Service
Tool information that will contain reasons
why PTO may not engage and why PTO
may unexpectedly disengage due to system
conditions.
See www.gmupfitter.com for information on
the installation of wiring and programming
for PTO aftermarket equipment.
Diesel Particulate Filter Cleaning during
PTO Operation
This feature is only available on Fleet and
Commercial vehicles. To verify that the
vehicle has this feature, see
www.gmupfitter.com to contact the GM
Upfitter Integration Group for assistance.
If equipped, this feature allows for manual
cleaning/regeneration of the Diesel
Particulate Filter (DPF) when it is unable to
clean itself. It may be necessary to perform
a manual regeneration if driving conditions
—
such as extended slow speed, stop-and-go
traffic, extended idles, short drive cycles,
or stationary PTO operation —prevent DPF
self-cleaning. Manual regeneration can only be used when
the DPF has become at least 90% full. At
100% full, it will attempt to automatically
self-clean if proper driving conditions are
met. The DPF will clean itself if the vehicle
can be driven above 50 km/h (30 mph) for
about 30 minutes.
Manual regeneration can be used during a
stationary PTO session. However it is
strongly recommended that the exhaust
filter be cleaned before continuous PTO.
If manual regeneration is operating
concurrently with PTO then the PTO system
will retain control of the engine speed. Low
PTO engine speeds will cause regeneration
to take longer. To initiate a manual DPF
regeneration, see
“Manual Regeneration of
Diesel Particulate Filter” inDiesel Particulate
Filter 019.