GMC Yukon 2007 Owner's Manual page 430

Tow/Haul Mode
Tow/Haul is a feature that assists when pulling
a heavy trailer or a large or heavy load.
The purpose of the Tow/Haul mode is to:
•
Reduce the frequency and improve the
predictability of transmission shifts when
pulling a heavy trailer or a large or heavy load.
•
Provide the same solid shift feel when pulling a
heavy trailer or a large or heavy load as when
the vehicle is unloaded.
•
Improve control of vehicle speed while
requiring less throttle pedal activity when
pulling a heavy trailer or a large or heavy load.
•
Increase the charging system voltage to assist
in recharging a battery installed in a trailer.
430
Press this button at the end of the shift lever to
enable/disable the tow/haul mode.
A light on the instrument
panel will illuminate to
indicate that tow/haul
mode has been
selected.