P0602 CHECKSUM ERROR
When Monitored and Set Condition:
When Monitored: While the ignition is on.
Set Condition: A deviation between the ECM memory and a stored calibration.
- FLASH ECM
Using the DRBIII®, reflash the ECM with the proper calibration for the particular truck. Is the flash successful?
Yes --> Repair complete.
No --> Go To 2
With the DRBIII®, read DTCs. Did P0602 set after the reflash?
Yes --> Replace the ECM.
No --> Test Complete.