DTC P0605 Internal Control Module Read Only Memory (ROM) Error
WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For the diagnostic procedure, refer to
DTC P0607 CONTROL MODULE PERFORMANCE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).