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 LIMITED, FWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 393 (SMART KEY SYSTEM (FOR START, EXCEPT HEV) - DIAGNOSTIC CODES)
2025 Toyota Highlander Limited, FWD
Section 393 (Smart Key System (For Start, Except HEV) - Diagnostic Codes)
2025 Toyota Highlander Limited, FWDSECTION Section 393 (Smart Key System (For Start, Except HEV) - Diagnostic Codes)
WARNING: This page is about a different car, the 2025 Toyota Corolla Cross, 2024 Toyota Corolla Cross, and 2023 Toyota Corolla Cross. However, it is still accessible from the selected car via links, so may be relevant.
- SMART KEY SYSTEM (for Start Function, Gasoline Model)
- DTC B2271-11: IG Circuit Short to Ground [11/2022 - 11/2023]
- DTC B2271-11: IG Circuit Short to Ground [11/2023 - ]
- DTC B2274-11: ACC Circuit Short to Ground [11/2022 - ]
- DTC B2278-62: Engine/Power Switch Signal Compare Failure [11/2022 - ]
- DTC B2282-31: Vehicle Speed Signal Circuit Open; DTC B2282-62: Vehicle Speed Signal Compare Failure [11/2022 - ]
- DTC B2285-62: Steering Lock Position Signal Compare Failure [11/2022 - ]
- DTC B228B-00: Battery Circuit or Ground Circuit Energization Malfunction [11/2022 - ]
- DTC B277A-96: Wireless Starter Component Internal Failure [11/2022 - ]
- DTC B2781-87: Steering Lock System Missing Message; DTC B2781-96: Steering Lock System Component Internal Failure; DTC B2782-11: Power Source Control System Circuit Short to Ground; DTC B2782-15: Power Source Control System Circuit Short to Battery or Open; DTC B279F-1C: Steering Lock Confirmation Signal Circuit Voltage Out of Range [11/2022 - ]
- DTC B2784-1C: Antenna Coil Circuit Voltage Out of Range [11/2022 - ]
- DTC B278D-96: ID-BOX Component Internal Failure [11/2022 - ]
- DTC B278E-87: Immobiliser Amp Missing Message [11/2022 - ]
- DTC B2790-46: ID-BOX Calibration / Parameter Memory Failure [11/2022 - ]
- DTC B2799-86: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [11/2022 - 11/2023]
- DTC B2799-86: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [11/2023 - ]
- DTC B279A-12: Engine Immobiliser System Circuit Short to Battery [11/2022 - 11/2023]
- DTC B279A-12: Engine Immobiliser System Circuit Short to Battery [11/2023 - ]
- DTC B279C-95: Engine Immobiliser System Incorrect Assembly [11/2022 - ]
- DTC B27A5-13: Front Floor Electrical Key Oscillator Circuit Open [11/2022 - ]
- DTC B27A7-13: Rear Floor 2 Electrical Key Oscillator Circuit Open [11/2022 - ]
- DTC P0335-62: Crankshaft Position Sensor "A" Signal Compare Failure [11/2022 - 11/2023]
- DTC P0335-62: Crankshaft Position Sensor "A" Signal Compare Failure [11/2023 - ]
- DTC P0571-62: Brake Switch "A" Signal Compare Failure [11/2022 - 11/2023]
- DTC P0571-62: Brake Switch "A" Signal Compare Failure [11/2023 - ]
- DTC U0129-87: Lost Communication with Brake System Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0155-87: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U1117-87: Lost Communication with Accessory Gateway Missing Message [11/2022 - ]
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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.