GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

Start the engine.

Does the CHECK ENG OIL PRESSURE message illuminate?

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Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

Verify proper oil pressure. Refer to Oil Pressure Diagnosis and Testing in Engine Mechanical - 4.3L or Oil Pressure Diagnosis and Testing in Engine Mechanical - 4.8L, 5.3L, 6.0L.

Did you find and correct the condition?

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System OK

Go to Engine Oil Pressure Gage Inaccurate or Inoperative