Chevrolet GMC Duramax 2023 Manual page 45

44 Driving and Operating
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 dealer.
Also see the service manual for more
information.
Your dealer can access Service Tool
information to determine 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.
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. In
PTO stationary session when DPF is in this
condition, one minute of horn chirps is
initiated as a warning to the operator to
look for the DIC message and take action for
Manual Regeneration. 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 under Diesel
Particulate Filter.