2003 GMC Sonoma Owner's Manual - Page 166

Check Gages Warning Light I The CHECK GAGES light will come on briefly when you are starting the engine. Fuel Gage CHECK GAGES @ FUEL ONLY If this light comes 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. United States Canada When the ignition is on, the fuel gage tells you about how much fuel you have remaining. 3-39