GMC CHEVROLET Silverado 6500HD 2019 Owner's Manual page 283

282 Driving and Operating
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.
Factory Preset Parameters
The following table lists the factory
preset parameters. These may be
altered by the GM Service Tool to
configure the various PTO features.