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

Turn ON the ignition, with the engine OFF.

Does the CHECK ENG OIL LEVEL message illuminate?

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Go to Low Engine Oil Level Indicator Diagnosis in Engine Controls - 4.3L.

or Engine Oil Level Sensor and/or Switch Diagnosis in Engine Controls - 4.8L, 5.3L, 6.0L.

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