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HOMESERVICE MANUALSTOYOTA2025HIGHLANDER XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM (T24A-FTS) - DIAGNOSTIC CODES (06 OF 11)SFI SYSTEMDTC P0606-09: CONTROL MODULE PROCESSOR (BRAKE OVERRIDE SYSTEM OUTPUT SIGNAL) COMPONENT FAILURE [10/2022 - ]PROCEDURE
2025 Toyota Highlander XLE, FWD

DTC P0606-09: Control Module Processor (Brake Override System Output Signal) Component Failure [10/2022 - ]: Procedure

2025 Toyota Highlander XLE, FWDSECTION Procedure
  1. READ OUTPUT DTC (IN ADDITION TO DTC P0606-09) 
    1. Wait 1 second or more.
    2. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P0606-09 is output A
      DTC P0606-09 and other DTCs are output B

    Result: 

    A 

    REPLACE ECM. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    See step  2

  2. GO TO DTC CHART 

    HINT: 

    After the inspection, perform the following procedure.

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  3

  3. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off and wait for at least 30 seconds.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 
    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    2. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTC P0606-09 is output B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.