P0604

P0604-ECM SOFTWARE ERROR


WHEN MONITORED
While the key is on.

SET CONDITION
Internal ECM software error.

POSSIBLE CAUSES
- REFlash ECM
- ECM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

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

Q: Was the flash successful?

YES: Go To 2
NO: Replace the ECM. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1

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

Q: Did P0604 set?

YES: Replace the ECM. Perform the POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). Powertrain Verification Test - Ver 1
NO: Test Complete.