Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Subaru Outback and 2002 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Check if any other DTCs are on display. If the Subaru Select Monitor or OBD-II general scan tool indicates DTC P0604, replace ECM. If the Subaru Select Monitor or OBD-II general scan tool do not indicate DTC P0604, it is not necessary to inspect DTC P0604.

Fig 1: Identifying DTC P0604: Internal Control Module Memory Check Sum Error, Circuit & Connector Terminals

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