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DTC P0604: Internal Control Module Random Access Memory (RAM) Error: Procedure

READ DTC OUTPUT (DTC P0604)
1. Clear the DTC.
2. Turn the ignition switch OFF.
3. Disconnect the battery negative terminal and wait for 1 minute.
4. Connect the battery negative terminal.
5. Turn the ignition switch to ON.
6. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
7. Read the DTCs.
  OK
  
  P0604 is not present.
NG → REPLACE ECM

OK → CHECK FOR INTERMITTENT PROBLEMS