P0601

P0601-INTERNAL MEMORY CHECKSUM INVALID

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

- When Monitored:
While the ignition is on.

- Set Condition:
A deviation between the ECM memory and a stored calibration.





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

1. FLASH ECM
1. Using the scan tool, reflash the ECM with the proper calibration for the particular truck.

Is the flash successful?

Yes

- Repair complete.

No

- Go To 2

2. ECM
1. With the scan tool, read DTCs.

Did P0601 set after the reflash?

Yes

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

No

- Test Complete.
- Perform POWERTRAIN VERIFICATION TEST (DIESEL). Powertrain Verification Test