Engine Control Module (ECM)

P0604-INTERNAL CONTROL MODULE RAM

For a complete wiring diagram refer to the Wiring Information Electrical Diagrams.

- When Monitored:
While the key is on.

- Set Condition:
Internal ECM software error.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

1. REFLASH ECM
1. Using the scan tool, reflash the module with latest calibration

Was the flash successful?

Yes

- Go To 2

No

- Replace the ECM.
- Perform POWERTRAIN VERIFICATION TEST (DIESEL). Powertrain Verification Test

2. ECM
1. Run the engine for one minute and shut off.
2. With the scan tool, read DTCs.

Did P0604 set?

Yes

- Replace the ECM.
- Perform POWERTRAIN VERIFICATION TEST (DIESEL). Powertrain Verification Test

No

- Test Complete.