2001 GMC Yukon Owner's Manual - Page 154

The following situations can cause the transmission to operate at higher temperatures: Low Traction Light (If Equipped) If you have the Traction Assist System, this light will come on when the system is limiting wheel spin. See "Traction Assist System" in the Index. You may feel or hear the system working or notice a lack of accelerator response, but this is normal. The LOW TRACTION light also comes on briefly when you turn your ignition to RUN. If the light doesn't come on then, the system may require service; have it fixed so it will be there to tell you when the Traction Assist System is active. Slippery road conditions may exist if the LOW TRACTION light comes on, so adjust your driving accordingly. D D D D D D Towing a trailer Hot outside air temperatures Hauling a large or heavy load Low transmission fluid level High transmission fluid level Restricted air flow to the radiator and the auxiliary transmission oil cooler (if equipped). 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" in the Index for the proper transmission maintenance intervals. 2-76