13
Operation
LOW Mode
LOW mode allows the driver to maximize engine braking and minimize the use
of the vehicle service brake when driving down long grades or coming to a stop.
• The driver may select LOW mode using the transmission driver inter-
face device while the vehicle is moving to prevent the transmission sys-
tem from Upshifting, and support Downshifting at the earliest
opportunity to enable higher engine RPM to promote maximum engine
braking based on vehicle operating conditions.
• If LOW mode is selected using the transmission driver interface device
while the vehicle is stationary, the transmission system will shift into
1st gear and remain there; any Upshift or Downshift requests using the
transmission driver interface device are not allowed.
WARNING: On low friction surfaces refrain from engine braking when in LOW
mode. Excessive engine braking at high engine RPM may cause a loss of trac-
tion and vehicle control and may result in major vehicle component damage,
severe injury or death.
Note: The transmission system may automatically override or prevent the
driver’s Upshift or Downshift request on the transmission driver interface
device or automatically initiate a gear change based on vehicle operating condi-
tions. Refer to
“Transmission MANUAL / LOW Mode Override” on page 14.
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