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 MANUALSTOYOTA2025GRAND HIGHLANDER HYBRID LIMITEDREPAIR AND DIAGNOSISQUICK LOOKUPSDTC INDEXDTC INDEX (2 OF 3)NETWORKING DTCSCAN COMMUNICATION SYSTEM (FOR 1MOTOR-HEV MODEL)
2025 Toyota Grand Highlander Hybrid Limited
CAN COMMUNICATION SYSTEM (for 1Motor-HEV Model)
2025 Toyota Grand Highlander Hybrid LimitedSECTION 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 |
| U01BD-87 | Lost Communication with DC/DC Converter Control Module "C" Missing Message |
| U0291-00 | Lost Communication with Gear Shift Control Module "B" (System 2) Missing Message |
| U0291-87 | Lost Communication with Gear Shift Control Module "B" 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 |
| U1150-00 | Lost Communication with Hybrid Powertrain Control Module (ch2) |
| U1150-87 | Lost Communication with Hybrid/EV Powertrain Control Module (ch2) Missing Message |
| U1159-87 | Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message |
| U1170-87 | Lost Communication with Brake System Control Module (ch2) Missing Message |
| U1176-87 | Lost Communication with Gear Shift Control Module "A" (ch2) Missing Message |
| U11B7-00 | Lost Communication with TCM (ch4) (System 2) Missing Message |
| U11B7-87 | Lost Communication with TCM (ch4) Missing Message |
| U11BC-87 | Lost Communication with Hybrid/EV Powertrain Control Module (ch6) Missing Message |
| U11BE-87 | Lost Communication with ECM/PCM "A" (ch7) 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.