2003 Hummer H2 Owner's Manual - Page 170
2003 Hummer H2 Manual
Page 170 highlights
The following situations can cause the transmission to operate at higher temperatures: TRAC OFF Light The TRAC OFF light will come on when a Traction Control System, Anti-Lock Brake System or engine-related problem has been detected and the vehicle needs service. Adjust your driving accordingly. See "Traction Control System (TCS)" in the Index. If the TCS detects that the vehicle's brakes are overheating, the TCS will shut off and the TRAC OFF light will come on. When the brakes cool off, the TCS will turn back on automatically and the TRAC OFF light will go out. 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. 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. 2-88
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