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)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESCAN COMMUNICATION SYSTEM (EXCEPT HEV) - CIRCUIT TESTS (1 OF 3) & DIAGNOSTIC CODESCAN COMMUNICATION SYSTEM (FOR GASOLINE MODEL)DTC U115C-87: LOST COMMUNICATION WITH ECM/PCM "A" (CH5) MISSING MESSAGE; DTC U0076-88: CONTROL MODULE COMMUNICATION BUS "D" OFF BUS OFF; DTC U0137-87: LOST COMMUNICATION WITH TRAILER BRAKE CONTROL MODULE MISSING MESSAGE; DTC U1170-87: LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE (CH2) MISSING MESSAGE; DTC U1171-87: LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE (CH3) MISSING MESSAGE [12/2024 - ]DESCRIPTION
2025 Toyota 4Runner SR5, RWD
DTC U115C-87: Lost Communication with ECM/PCM "A" (ch5) Missing Message; DTC U0076-88: Control Module Communication Bus "D" Off Bus Off; DTC U0137-87: Lost Communication With Trailer Brake Control Module Missing Message; DTC U1170-87: Lost Communication with Brake System Control Module (ch2) Missing Message; DTC U1171-87: Lost Communication with Brake System Control Module (ch3) Missing Message [12/2024 - ]: Description
2025 Toyota 4Runner SR5, RWDSECTION Description
| DTC No. | Detection Item | DTC Detection Condition | DTC Output from | Priority |
|---|---|---|---|---|
| U0076-88 | Control Module Communication Bus "D" Off Bus Off | Bus off condition continues for 1 second or more. | Trailer Brake Controller | A |
| U0137-87 | Lost Communication With Trailer Brake Control Module Missing Message | The DTC output ECU does not receive data from the trailer brake control ECU (brake control with bracket relay). | Engine | A |
| U115C-87 | Lost Communication with ECM/PCM "A" (ch5) Missing Message | The DTC output ECU does not receive data from the brake actuator assembly. | Engine Stop and Start Brake/EPB |
A |
| U1170-87 | Lost Communication with Brake System Control Module (ch2) Missing Message | The DTC output ECU does not receive data from the brake actuator assembly. | Stop and Start | A |
| U1171-87 | Lost Communication with Brake System Control Module (ch3) Missing Message | The DTC output ECU does not receive data from the brake actuator assembly. | Trailer Brake Controller Adaptive Variable Suspension System |
A |
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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.