Based off the information given you have a bad oil sensor.
The IPC uses the engine oil sensor signal to determine the engine oil pressure. The oil pressure sensor signal circuit is hard-wired to the IPC. The engine oil pressure sensor signal to the IPC is a variable resistance ranging from 0-90 Ohms . A sensor resistance of 1 Ohms will display as 0 psi (0 kPa) and a resistance of 88 Ohms will display as 80 psi (550 kPa) . The Check Engine Oil Pressure indicator will be displayed in the message center if the IPC detects a low engine oil pressure.
Tools Required: J 41712 Oil Pressure Sensor Socket
Remove the engine sight shield. IMPORTANT: Clean the area around the sensor before removal. Do not allow debris to enter the engine.
Disconnect the oil pressure sensor electrical connector.
Remove the oil pressure sensor using the J 41712 or equivalent.
Apply sealant GM P/N 12346004 or equivalent to the threads of the oil pressure sensor. NOTE: Refer to Fastener Notice in Service Precautions.
Use the J 41712 or equivalent in order to install the oil pressure sensor. Tighten Tighten the oil pressure sensor to 20 N.m (15 lb ft) .
Connect the oil pressure sensor electrical connector.
Install the engine sight shield.
Check and adjust engine oil level.
Thursday, October 30th, 2008 AT 11:59 PM