GMC 2007 Sierra 1500 Pickup Owner's Manual page 280

TRANSMISSION HOT
Notice: If you drive your vehicle while the
transmission fluid is overheating and the
transmission temperature warning is displayed
on the instrument panel cluster and/or DIC,
you can damage the transmission. This could
lead to costly repairs that would not be
covered by your warranty. Do not drive your
vehicle with overheated transmission fluid
or while the transmission temperature warning
is displayed.
If the transmission fluid temperature becomes
high, this message will appear on the DIC display.
When the transmission enters the protection
mode, you may notice a change in the
transmission shifting patterns. When the
transmission fluid temperature returns to normal,
the display will turn off and the transmission
shifting patterns will return to normal.
280
If the vehicle has the Tow/Haul mode, use this
feature if the transmission is operating at higher
temperatures and/or the following situations
exist, which can cause the transmission to operate
at higher temperatures:
•
Towing a trailer
•
Hot outside air temperatures
•
Hauling a large or heavy load
•
Over-loading
•
Low transmission fluid level
•
High transmission fluid level
•
Restricted air flow to the radiator and the
auxiliary transmission oil cooler
A temporary solution to hotter transmission
operating temperatures may be to let the
transmission cool down. If the transmission is
operated at higher temperatures on a frequent
basis, see Scheduled Maintenance (Gasoline
Engine) on page 617 for the transmission
your vehicle is equipped with for the proper
transmission maintenance intervals. Also see
Transmission Temperature Gage on page 257 for
more information.