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P0602 Checksum Error

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By Mopar1973Man

· 1,458 views

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.

POSSIBLE CAUSES

  • FLASH ECM
  • ECM

DIAGNOSTIC PROCEDURE

  1. 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
  2. With the DRBIII®, read DTCs. Did P0602 set after the reflash?
    Yes --> Replace the ECM.
    No --> Test Complete.

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