DTC P0604

Circuit Description

The powertrain control module (PCM) performs an internal self-test on the random access memory (RAM) or on the read/write memory. If the self-test fails, this diagnostic trouble code (DTC) sets.

Conditions for Running the DTC

The ignition voltage is more than 10 volts.
The ignition is ON for 5 seconds.

Conditions for Setting the DTC

The internal RAM test fails.

Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

Test Description

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

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

Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .

Did you complete the replacement?

Go to Diagnostic System Check - Engine Controls

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