P0601

P0601-INTERNAL MEMORY CHECKSUM INVALID

For complete wiring diagrams 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.

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. Powertrain Verification Test

No

- Test Complete.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test