GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster Diagnostic System Check performed?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

Inspect the vehicle for diagnostic trouble codes (DTCs).

Are any DTCs present?

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Go to Diagnostic Trouble Code (DTC) List/Type in Engine Controls - 2.5L (LB8) and 3.0L (L46)

Go to Step 3

3

  1. Turn the ignition switch to the ON position.
  2. Connect a scan tool and enter into Instrument Cluster diagnostics.
  3. WOW the instrument cluster on and off.

Is the SERVICE ENGINE SOON indicator off?

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Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 2.5L (LB8) and 3.0L (L46)

Go to Step 4

4

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

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Go to Diagnostic System Check - Instrument Cluster

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