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  • P0602 Checksum Error

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    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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