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 MANUALSTOYOTA2025HIGHLANDER XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALSTARTERSTOP AND START SYSTEM - DIAGNOSTIC CODES (3 OF 3) & CIRCUIT TESTS (1 OF 3)STOP AND START SYSTEMDTC U0100-87: LOST COMMUNICATION WITH ECM/PCM "A" MISSING MESSAGE; DTC U0129-87: LOST COMMUNICATION WITH BRAKE SYSTEM 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 U0164-87: LOST COMMUNICATION WITH HVAC CONTROL MODULE MISSING MESSAGE [10/2022 - 11/2023]MONITOR STRATEGY
2025 Toyota Highlander XLE, FWD
Monitor Strategy
2025 Toyota Highlander XLE, FWDSECTION Monitor Strategy
| Related DTCs | U0100: Lost communication with engine control module (starter / generator control module) verify communication U0129: Lost communication with brake system control module (starter / generator control module) verify communication |
| Required Sensors/Components (Main) | Engine stop and start ECU |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Continuous |
| Frequency of Operation | 1 seconds: U0100 2.22 seconds: U0129 |
| Duration | 2 driving cycles |
| Sequence of Operation | None |
RENDER: 1.0x
NO RELATED
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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.