Service Four-Wheel Drive Warning Light; Check Gages Warning Light; Gate Ajar Light - GMC 2006 Envoy Owner's Manual

Service Four-Wheel Drive
Warning Light
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 GM dealer in
correctly diagnosing a malfunction.
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This light should come on
briefly when you turn on
the ignition, as a check to
show you it is working.

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.

Gate Ajar Light

Close the liftgate or liftglass. Never drive with the liftgate
or liftglass even partially open.
The check gages light will
come on briefly when you
are starting the engine.
If this light comes on, your
liftgate or liftglass is not
completely shut.