OIl PRESSURE SWITCH

There is no fuse for the oil sending unit ! Oil lite on , gauge not working ? Do you know what PCM five volt reference voltage is ? The PCM - engine computer supply's a stable 5 volt voltage to engine sensors . The oil pressure sensor is one of these sensors .
Engine Oil Pressure Sensor
The engine oil pressure sensor is a solid state transducer. The engine oil pressure sensor sends oil pressure information to the PCM. The PCM then transmits the oil pressure information to the IPC via serial data.
Engine oil pressure is displayed on the scan tool in volts. A low voltage reading indicates low oil pressure. As the oil pressure increases, the voltage level also increases. The normal range of the engine oil level sensor signal voltage is 0.5 volts at 0 kPa (0 psi) to 4.5 volts at 883 kPa (128 psi).

http://www.autozone.com/autozone/repairinfo/componentlocations/componentLocationMain.jsp?fromSearchPage=true&categoryNValue=4294963411&categoryName=Oil+Pressure+Switch

hello
Does the icon look like a oil can or is a oil life reminder light if it is a oil can icon then you need to check the vehicles oil pressure and make sure that it does have the correct amount of oil pressure and you have voltage to yhe oil pressure sending unit(switch) if it does then you need to replace the oil pressure sending unit(switch) seen alot of problem with the sending units
Good luck
Chris

Sounds like your oil pressure sending unit is faulty! When you turn the key on, is the gauge reading low, then you start it and it pegs out? if so, the sending unit has failed.

Do you know where the starter is?Is in that area.

Sounds like the low oil sensor is bad or corroded. Check and clean. If that doesn't fix, replace it.

faulty oil pump or gauge

replace the oil pressure gage sending unit, it is a common problem with all GM oil pressure gages.

Change the oil pressure switch then try

Yes, replace the sensor its close to th oil filter.