2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 272

Four-Wheel-Drive Light The four-wheel-drive light comes on when a vehicle with a manual transfer case is shifted into four-wheel drive and the front axle engages. Fuel Gauge Some delay between the shifting and the light coming on is normal. See Four-Wheel Drive on page 3‑39 for more information. United States Canada Tow/Haul Mode Light For vehicles with the tow/ haul mode feature, this light comes on when the Tow/Haul mode has been activated. When the ignition is on, the fuel gauge shows about how much fuel is left in the fuel tank. An arrow on the fuel gauge indicates the side of the vehicle the fuel door is on. The gauge will first indicate empty before the vehicle is out of fuel, but the vehicle's fuel tank should be filled soon. When the fuel tank is low the FUEL LEVEL LOW message appears. See DIC Warnings and Messages on page 4‑66 for more information. For more information, see Tow/Haul Mode on page 3‑36. 4-48