GMC 2010 Yukon/Yukon XL Owner's Manual page 260

If it does not, have the vehicle serviced by your dealer.
If the system is working normally the indicator light then
goes off.
If the light comes on and stays on while driving, there
could be a problem with the StabiliTrak
vehicle might need service. When this warning light is
®
on, the StabiliTrak system is off and does not limit
wheel spin.
The light flashes if the system is active and is working
to assist the driver with directional control of the vehicle
in difficult driving conditions.
®
See StabiliTrak System on page 5 6 for more
information.
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For vehicles with the
®
StabiliTrak system, this
light comes on briefly
while starting the engine.
®
system and the
This gauge shows the engine coolant temperature.
It also provides an indicator of how hard the vehicle is
working. During a majority of the operation, the gauge
reads 210°F (100°C) or less. If you are pulling a load
or going up hills, it is normal for the temperature to
fluctuate and approach the 250°F (122°C) mark. If the
gauge reaches the 260°F (125°C) mark, it indicates that
the cooling system is working beyond its capacity.
See Engine Overheating on page 6 36.
If the vehicle is a Two-mode Hybrid, see the Two-mode
Hybrid manual for more information.