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HOMESERVICE MANUALSTOYOTA2025HIGHLANDER XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALSTARTERSTOP AND START SYSTEM - DIAGNOSTIC CODES (3 OF 3) & CIRCUIT TESTS (1 OF 3)STOP AND START SYSTEMDTC U0100-87: LOST COMMUNICATION WITH ECM/PCM "A" MISSING MESSAGE; DTC U0126-87: LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE MISSING MESSAGE; DTC U0129-87: LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE MISSING MESSAGE; DTC U0131-87: LOST COMMUNICATION WITH POWER STEERING CONTROL MODULE MISSING MESSAGE; DTC U0140-87: LOST COMMUNICATION WITH BODY CONTROL MODULE MISSING MESSAGE; DTC U0151-87: LOST COMMUNICATION WITH RESTRAINTS CONTROL MODULE MISSING MESSAGE; DTC U0164-87: LOST COMMUNICATION WITH HVAC CONTROL MODULE MISSING MESSAGE; DTC U1110-87: LOST COMMUNICATION WITH INTUITIVE PARKING ASSIST MODULE MISSING MESSAGE [12/2019 - 10/2022]PROCEDURE
2025 Toyota Highlander XLE, FWD

DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module Missing Message; DTC U0131-87: Lost Communication with Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U0164-87: Lost Communication with HVAC Control Module Missing Message; DTC U1110-87: Lost Communication with Intuitive Parking Assist Module Missing Message [12/2019 - 10/2022]: Procedure

2025 Toyota Highlander XLE, FWDSECTION Procedure
  1. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Stop and Start > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK DTC OUTPUT 
    1. Turn the ignition switch off and wait for 30 seconds or more.
    2. Start the engine.
    3. Perform a road test.
    4. Read the DTCs.

      Powertrain > Stop and Start > Trouble Codes 

      Result

      Result Proceed to
      DTC U0100-87, U0126-87, U0129-87, U0131-87, U0140-87, U0151-87, U0164-87, or U1110-87 is output A
      DTC U0100-87, U0126-87, U0129-87, U0131-87, U0140-87, U0151-87, U0164-87 or U1110-87 is not output B

    Result: 

    A 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

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.