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Home >> Lexus >> 2025 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Engine Control System - Diagnostic Codes (P0524-P064A)) >> SFI System >> DTC P0604-44: Internal Control Module Random Access Memory (RAM) Error Data Memory Failure [03/2022 - ] >> Procedure

DTC P0604-44: Internal Control Module Random Access Memory (RAM) Error Data Memory Failure [03/2022 - ]: Procedure

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  1. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. READ OUTPUT DTC (DTC P0604-44) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Wait 16 seconds or more.
    4. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTC P0604-44 is output B

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [11/2021 - ] 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [11/2021 - ] 

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