Check Gages Warning Light; Gate Ajar Light - GMC 2009 Envoy Denali Owner's Manual

The service four-wheel drive light comes on to indicate
that there may be a problem with the drive system
and service is required. Malfunctions can be indicated
by the system before any problem is apparent,
which may prevent serious damage to the vehicle.
This system is also designed to assist your dealer in
correctly diagnosing a malfunction.

Check Gages Warning Light

If the light comes on and stays on while you are
driving, check your coolant temperature and engine oil
pressure gages to see if they are in the warning zones.
The check gages light will
come on briefly when you
are starting the engine.

Gate Ajar Light

Close the liftgate or liftglass. Never drive with the liftgate
or liftglass even partially open.
If this light comes on, the
liftgate or liftglass is not
completely shut.
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