P0601

P0601-INTERNAL MEMORY CHECKSUM INVALID

For a complete wiring diagram Refer to Diagrams/Electrical.


- 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. Initial Inspection and Diagnostic Overview


Diagnostic Test


1. FLASH ECM
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
With the scan tool, read DTCs.
Did P0602 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