2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 270

Oil Pressure Light Notice: Lack of proper engine oil maintenance can damage the engine. The repairs would not be covered by the vehicle warranty. Always follow the maintenance schedule in this manual for changing engine oil. This light comes on briefly while starting the engine. If it does not, have the vehicle serviced by your dealer. If the system is working normally the indicator light then goes off. If the light comes on and stays on, it means that oil is not flowing through the engine properly. The vehicle could be low on oil and it might have some other system problem. { WARNING: Do not keep driving if the oil pressure is low. The engine can become so hot that it catches fire. Someone could be burned. Check the oil as soon as possible and have the vehicle serviced. 4-46