2003 Hummer H2 Owner's Manual - Page 238
2003 Hummer H2 Manual
Page 238 highlights
To enter this mode, press the TC2 button located on the instrument panel to the right of the steering wheel. If you restart your engine, the system reverts to the TCS mode. When the TRAC OFF light is on, adjust your driving accordingly. TC2 only operates in the following transfer case modes: D 4HI Lock D 4LO Lock D 4LO Lock and Differential Lock It will not operate in 4HI. If the TC2 button is pressed while in 4HI, the light will flash for about 15 seconds and then go out. The light should also come on briefly when you turn the ignition key to RUN; if it doesn't, see your dealer for service. 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. See "TRAC OFF Light" in the Index. The Traction Control System, as delivered from the factory, will automatically come on whenever you start your vehicle. 4-10
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