GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Electrical 🢒 CHECK ENG OIL PRESSURE Not Operating Properly

Step

Action

Value(s)

Yes

No

1

Was the instrument panel cluster (IPC) system check performed?

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Go to Step 2

Go to Instrument Cluster System Check

2
  1. Turn the ignition switch to the ON position.
  2. With a scan tool select instrument panel cluster (IPC), special functions, and lamp test.
  3. Command the check engine oil pressure message ON.

Does the check engine oil pressure message turn ON and OFF when commanded?

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Go to Engine Oil Pressure Gage Inaccurate or Inoperative

Go to Step 3

3

Replace the IPC. Refer to Instrument Cluster Replacement

Is the repair complete?

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Go to Instrument Cluster System Check

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