2012 GMC Sierra Owner's Manual - Page 153

Instruments and Controls 5-15 Engine Oil Pressure Gauge A reading outside the normal operating range can be caused by a dangerously low oil level or some other problem causing low oil pressure. Check the vehicle's oil as soon as possible. See "OIL PRESSURE LOW STOP ENGINE" under Engine Oil Messages on page 5‑42 and Engine Oil on page 10‑7. Notice: Lack of proper engine oil maintenance can damage the engine. Driving with the engine oil low can also damage the engine. The repairs would not be covered by the vehicle warranty. Check the oil level as soon as possible. Add oil if required, but if the oil level is within the operating range and the oil pressure is still low, have the vehicle serviced. Always follow the maintenance schedule for changing engine oil. If the vehicle has a diesel engine, see the Duramax diesel supplement for more information. English Metric The engine oil pressure gauge shows the engine oil pressure in kPa (kilopascals) or psi (pounds per square inch) when the engine is running. Oil pressure can vary with engine speed, outside temperature and oil viscosity, but if readings are outside the normal operating range, the oil pressure light comes on. See Engine Oil Pressure Light on page 5‑28 for more information.