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)QUICK LOOKUPSDTC INDEXDTC INDEX (2 OF 2)NETWORKING DTCSCAN COMMUNICATION SYSTEM (FOR GASOLINE MODEL)
2025 Toyota 4Runner SR5, RWD
CAN COMMUNICATION SYSTEM (for Gasoline Model)
2025 Toyota 4Runner SR5, RWDSECTION CAN COMMUNICATION SYSTEM (for Gasoline Model)
CAN COMMUNICATION SYSTEM (FOR GASOLINE MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B1020-04 | Central Gateway ECU System Internal Failure |
| U0076-88 | Control Module Communication Bus "D" Off Bus Off |
| U0137-87 | Lost Communication With Trailer Brake Control Module Missing Message |
| U115C-87 | Lost Communication with ECM/PCM "A" (ch5) Missing Message |
| U1170-87 | Lost Communication with Brake System Control Module (ch2) Missing Message |
| U1171-87 | Lost Communication with Brake System Control Module (ch3) Missing Message |
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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.