2001 GMC Savana Van Owner's Manual - Page 141

NOTICE: If you keep driving your vehicle with this light on, after a while, your emission controls may not work as well, your fuel economy may not be as good and your engine may not run as smoothly. This could lead to costly repairs that may not be covered by your warranty. Oil Pressure Gage The oil pressure gage shows the engine oil pressure in psi (pounds per square inch) when the engine is running. Canadian vehicles indicate pressure in kPa (kilopascals). Reduced Engine Power The REDUCED ENGINE POWER light will come on when the cooling system temperature gets too hot and the engine further enters the engine coolant protection mode. See "Engine Overheating" in the Index for further information. Oil pressure may vary with engine speed, outside temperature and oil viscosity, but readings above the low pressure zone indicate the normal operating range. A reading in the low pressure zone may be caused by a dangerously low oil level or other problem causing low oil pressure. Check your oil as soon as possible. 2-64