6.7L Diesel

P0604-INTERNAL CONTROL MODULE RAM

For a complete wiring diagram Refer to Diagrams/Electrical.


- When Monitored:
While the key is on.

- Set Condition:
Internal ECM software error.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview


Diagnostic Test


1. REFLASH ECM
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
Run the engine for one minute and shut off.
With the scan tool, read DTCs.
Did P0604 set?

Yes


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


No


- Test Complete.