DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" 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 U0293-87: Lost Communication with Hybrid/EV Powertrain Control Module Missing Message; DTC U114F-87: Lost Communication with Power Integration Module Missing Message [12/2024 - ]: Procedure

2025 Toyota 4Runner SR5, RWDSECTION Procedure
  1. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Blind Spot Monitor "B" > Trouble Codes 

      Result

      Result Proceed to
      U0100-87, U0129-87, U0131-87, U0140-87, U0293-87, U114F-87 and U0232-87 are output A
      U0100-87, U0131-87, U0140-87, U0293-87 or U114F-87 is output B
      DTCs are not output C
      None of the above conditions are met D

      HINT: 

      • If CAN communication system DTCs are stored, they may also be stored for other systems.
      • If the CAN communication system has been inspected and repaired, the DTCs will not be output when rechecking for DTCs.
      • If these DTCs are output frequently, duplicate the conditions that cause the problem symptoms and perform the inspection again, even if the DTCs were not output when rechecking for DTCs.

        Refer to METHOD TO SIMULATE PROBLEM SYMPTOMS [12/2024 - ]

    Result: 

    GO TO DTC U0232-87 

    Refer to DTC U0232-87: Lost Communication with Side Obstacle Detection Control Module "A" Missing Message [12/2024 - ] 

    Result: 

    REFER TO " CAN COMMUNICATION SYSTEM (HEV) - DIAGNOSTICS - INTRODUCTION  " 

    Result: 

    USE SIMULATION METHOD TO CHECK 

    Refer to METHOD TO SIMULATE PROBLEM SYMPTOMS [12/2024 - ]

    Result: 

    GO TO  BLIND SPOT MONITOR SYSTEM - DIAGNOSTICS - INTRODUCTION 

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.