Wait To Start Indicator; Malfunction Indicator Lamp - GMC TopKick 2007 Owner's Manual

Wait to Start Indicator

If your vehicle has the DURAMAX
engine, it will have glow plugs and an air
intake heater. If your vehicle has the Isuzu 6H
diesel engine, it will have glow plugs and an inlet
heater. If your vehicle has a Caterpillar
it will have an inlet heater.
Wait until the indicator light goes off before turning
the ignition key to START.
172
®
6.6L diesel
®
engine,
The light in the center of
the instrument panel will
come on when the inlet
heater or glow plugs are
on and the ignition key is
in RUN.

Malfunction Indicator Lamp

Service Engine Soon Light
First, you will not notice any difference in engine
performance, but your tail pipe emissions may
increase. Second, your engine may not run
properly or may stall without warning. If either of
these things happen, drive or tow your vehicle
to your dealer for service.
This light should come on when the ignition is on,
but the engine is not running, as a check to
show you it is working. If it does not come on at
all, have it repaired.
Notice: If you keep driving your vehicle with
this light on, after awhile, your emission
controls may not work as well, your fuel
economy may not be as good, and your engine
may not run as smoothly. This could lead to
costly repairs that may not be covered by your
warranty.
If this light comes on or
flashes while you are
driving, two things
may happen.