GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the IPC System Check?

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Go to Step 2

Go to IPC System Check

2

The following symptoms are covered in the IPC Symptom Reference Table. Do not use this procedure in order to diagnose the following conditions:

    • PRNDL displays PARK but no other gears.
    • PRNDL displays all of the gear positions except PARK.
    • No gear is displayed on PRNDL.

Is the condition being diagnosed listed above?

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Go to IPC System Check

Go to Step 3

3

Use a scan tool in order to command the cluster to display each gear on the PRNDL display.

Does the cluster display the proper gear when commanded by the scan tool?

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Go to Step 4

Go to Step 6

4

  1. Turn the ignition switch to the RUN position.
  2. Move the gear selector through the range of gears while monitoring the PRNDL state with a scan tool.
  3. Compare the scan tool data to the PRNDL display on the cluster.
  4. Compare the transmission position read outs on the scan tool to the IPC PRNDL displays.

Does the PRNDL display agree with the scan tool data?

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Go to Step 5

Go to Step 6

5

Compare the scan tool data with the PRNDL display.

Does the scan tool data accurately indicate the position of the gear selector?

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Go to IPC System Check

Go to Symptoms in Engine Controls - 2.2L or Symptoms in Engine Controls 4.3L

6

Replace the IPC. Refer to Instrument Cluster Replacement .

Is the action complete?

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Go to IPC System Check

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