GMC 2006 Sierra - Manual (Page 321)

When the traction off light is
on, the TAS is off and will
not limit wheel spin. Adjust
your driving accordingly.
The traction off light will come on under the following
conditions:
• The Traction Assist System is turned off, either
by pressing the TAS on/off button, located on
the instrument panel, or by turning off the automatic
engagement feature of the TAS.
• The transmission is in FIRST (1); TAS will not
operate in this gear. This is normal.
• The vehicle is driven on an extremely rough road.
When the vehicle leaves the rough surface, slows
down or stops, the light will go off and TAS will turn
on again. This is normal.
• A Traction Assist System, Anti-Lock Brake System
or engine-related problem has been detected and
the vehicle needs service.
• If the vehicle has been driven with the TAS system
on for long periods of time, or if the vehicle has
gone through many several high speed braking
maneuvers the system may be automatically
disabled. The system will automatically re-enable
after approximately two minutes of not using
the brakes.
See Traction Off Light on page 3-43.
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