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)QUICK LOOKUPSDTC INDEXDTC INDEX (2 OF 2)NETWORKING DTCSCAN COMMUNICATION SYSTEM (FOR 1MOTOR-HEV MODEL)
2025 Toyota 4Runner SR5, 4WD
CAN COMMUNICATION SYSTEM (for 1Motor-HEV Model)
2025 Toyota 4Runner SR5, 4WDSECTION CAN COMMUNICATION SYSTEM (for 1Motor-HEV Model)
CAN COMMUNICATION SYSTEM (FOR 1MOTOR-HEV MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B1020-04 | Central Gateway ECU System Internal Failure |
| U0077-88 | Control Module Communication Bus "E" Off Bus Off |
| U0137-87 | Lost Communication With Trailer Brake Control Module Missing Message |
| U029A-87 | Lost Communication with Hybrid/EV Battery Sensor Module Missing Message |
| U111A-00 | Lost Communication with ECM/PCM "A" (ch2) |
| U111A-87 | Lost Communication with ECM/PCM "A" (ch2) Missing Message |
| U1150-87 | Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message |
| U1170-87 | Lost Communication with Brake System Control Module (Secondary CAN Line) Missing Message |
| U1171-87 | Lost Communication with Brake System Control Module (ch3) Missing Message |
| U117D-87 | Lost Communication with Brake System Control Module (ch4) Missing Message |
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.