Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA20254RUNNER SR5, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESMECHANICAL - HYDRAULICELECTONICALLY CONTROLLED BRAKE SYSTEM (EXCEPT HEV) - DIAGNOSTIC CODES (2 OF 2), SYMPTOM TESTS & CIRCUIT TESTSELECTRONICALLY CONTROLLED BRAKE SYSTEM (FOR GASOLINE MODEL)DTC U0100-87: LOST COMMUNICATION WITH ECM/PCM "A" MISSING MESSAGE; DTC U0101-87: LOST COMMUNICATION WITH TCM MISSING MESSAGE; DTC U0114-87: LOST COMMUNICATION WITH FOUR-WHEEL DRIVE CLUTCH CONTROL MODULE MISSING MESSAGE; DTC U0125-87: LOST COMMUNICATION WITH MULTI-AXIS ACCELERATION SENSOR MODULE MISSING MESSAGE; DTC U0126-87: LOST COMMUNICATION WITH STEERING ANGLE SENSOR 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 U115C-87: LOST COMMUNICATION WITH ECM/PCM "A" (CH5) MISSING MESSAGE [12/2024 - ]PROCEDURE
2025 Toyota 4Runner SR5, RWD
DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0114-87: Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor 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 U115C-87: Lost Communication with ECM/PCM "A" (ch5) Missing Message [12/2024 - ]: Procedure
2025 Toyota 4Runner SR5, RWDSECTION Procedure
- CHECK DTC (HEALTH CHECK)
- Perform the Health Check using the GTS.
Result
Result Proceed to DTCs other than CAN communication system DTCs are output. A Only CAN communication system DTCs are output. B None of the above conditions are met. C
Result:
A
GO TO DIAGNOSTIC TROUBLE CODE CHART (RELATED SYSTEM)
Result:
B
REFER TO "CAN COMMUNICATION SYSTEM"
Result:
C
USE SIMULATION METHOD TO CHECK
- Perform the Health Check using the GTS.
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.