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

CHECK DTC
1. Clear DTC. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch off.
3. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
4. Connect the cable to the negative (-) battery terminal.
5. Turn the engine switch on (IG).
6. Check DTC.
  OK
  
  P0604 is not output.
NG → See step 3

OK → See step 2
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
REPLACE ECM. Refer to REMOVAL