GMC 1995 Suburban Owner's Manual page 148

NOTICE:
If you keep driving your vehicle with this light on, after a while
the emission controls won't work as well, your fuel economy
won't be as good, and your engine may not run as smoothly.
This could lead to costly repairs not covered by your warranty.
K
S
This orange light will come on briefly when you are starting the engine. If
the light comes on and stays on while you are driving, it could indicate
a
problem with your vehicle. It could be a problem with your oil pressure,
coolant temperature, or some other problem. Check your various gages to
see if they are in the warning zones. If they are, have your vehicle serviced
right away.
Daytime Running Lamps (DRL) Indicator Light
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