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, 4WDREPAIR 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 - ]DESCRIPTION
2025 Toyota 4Runner SR5, 4WD
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 - ]: Description
2025 Toyota 4Runner SR5, 4WDSECTION Description
The airbag ECU assembly has a built-in yaw rate and acceleration sensor.
The following DTCs are output when there is a communication malfunction between a sensor or ECU.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority |
|---|---|---|---|---|---|
| U0100-87 | Lost Communication with ECM/PCM "A" Missing Message | When the power source voltage is normal, data is not able to be received from the ECM for 2 seconds or more. |
|
Brake/EPB | B |
| U0101-87 | Lost Communication with TCM Missing Message | When the power source voltage is normal, data is not able to be received from the TCM for 2 seconds or more. |
|
Brake/EPB | B |
| U0114-87 | Lost Communication with Four-Wheel Drive Clutch Control Module Missing Message | When the power source voltage is normal, data is not able to be received from the 4 wheel drive control ECU for 2 seconds or more. |
|
Brake/EPB | B |
| U0125-87 | Lost Communication with Multi-axis Acceleration Sensor Module Missing Message | When the power source voltage is normal, data is not able to be received from the yaw rate and acceleration sensor (airbag ECU assembly) for 1 second or more. |
|
Brake/EPB | B |
| U0126-87 | Lost Communication with Steering Angle Sensor Module Missing Message | When the power source voltage is normal, data is not able to be received from the steering sensor for 1 second or more. |
|
Brake/EPB | B |
| U0131-87 | Lost Communication With Power Steering Control Module Missing Message | When the power source voltage is normal, data is not able to be received from the power steering ECU assembly for 1 second or more. |
|
Brake/EPB | B |
| U0140-87 | Lost Communication with Body Control Module Missing Message | When the power source voltage is normal, data is not able to be received from the main body ECU (multiplex network body ECU) for 2 seconds or more. |
|
Brake/EPB | B |
| U0151-87 | Lost Communication with Restraints Control Module Missing Message | When the power source voltage is normal, data is not able to be received from the airbag ECU assembly for 5 seconds or more. |
|
Brake/EPB | B |
| U115C-87 | Lost Communication with ECM/PCM "A" (ch5) Missing Message | When the power source voltage is normal, data is not able to be received from the ECM for 2 seconds or more. |
|
Brake/EPB | B |
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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.