DTC P0604: Internal Control Module Memory Check Sum Error
WARNING: This page is about a different car, the 2002 Subaru Outback, 2002 Subaru Legacy, 2002 Subaru Impreza, and 2002 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Perform test procedure. See TESTING PROCEDURE . If DTC P0604 exists, replace ECM. Do not diagnose DTC P0604. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES and VERIFICATION PROCEDURE .