GM Service Manual Online
For 1990-2009 cars only

Circuit Description

This diagnostic indicates that the powertrain control module (PCM) detects an internal microprocessor integrity fault.

Conditions for Running the DTC

The PCM is powered-up.

Conditions for Setting the DTC

The PCM detects an internal microprocessor integrity fault.

Action Taken When the DTC Sets

    • The PCM will illuminate the malfunction indicator lamp (MIL) during the first trip in which the diagnostic test has been run and failed.
    • The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.

Test Description

The number below refers to the step number on the diagnostic table.

  1. This DTC indicates an internal PCM condition.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

Replace the PCM. Refer to Powertrain Control Module Replacement .

Did you complete the replacement?

Go to Diagnostic System Check - Engine Controls

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