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 DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 28 (SMART KEY SYSTEM (FOR START, HEV) - DIAGNOSTIC CODES)
2025 Toyota 4Runner SR5, 4WD
Section 28 (Smart Key System (For Start, HEV) - Diagnostic Codes)
2025 Toyota 4Runner SR5, 4WDSECTION Section 28 (Smart Key System (For Start, HEV) - Diagnostic Codes)
WARNING: This page is about a different variant/trim than selected.
- SMART KEY SYSTEM (for Start Function, HEV Model)
- DTC B2271-11: IG Circuit Short to Ground [12/2024 - ]
- DTC B2274-11: ACC Circuit Short to Ground [12/2024 - ]
- DTC B2278-62: Engine/Power Switch Signal Compare Failure [12/2024 - ]
- DTC B2280-11: Starter Request Circuit Circuit Short to Ground [12/2024 - ]
- DTC B2282-31: Vehicle Speed Signal Circuit Open; DTC B2282-62: Vehicle Speed Signal Compare Failure [12/2024 - ]
- DTC B2285-62: Steering Lock Position Signal Compare Failure [12/2024 - ]
- DTC B228B-00: Battery Circuit or Ground Circuit Energization Malfunction [12/2024 - ]
- DTC B277A-96: Wireless Starter Component Internal Failure [12/2024 - ]
- 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 [12/2024 - ]
- DTC B2784-1C: Antenna Coil Circuit Voltage Out of Range [12/2024 - ]
- DTC B278D-96: ID-BOX Component Internal Failure [12/2024 - ]
- DTC B278E-87: Immobiliser Amp Missing Message [12/2024 - ]
- DTC B2790-46: ID-BOX Calibration / Parameter Memory Failure [12/2024 - ]
- DTC B2799-86: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [12/2024 - ]
- DTC B279A-12: Engine Immobiliser System Circuit Short to Battery [12/2024 - ]
- DTC B279C-95: Engine Immobiliser System Incorrect Assembly [12/2024 - ]
- DTC B27A5-13: Front Floor Electrical Key Oscillator Circuit Open [12/2024 - ]
- DTC B27A6-13: Rear Floor Electrical Key Oscillator Circuit Open [12/2024 - ]
- DTC B27A7-13: Rear Floor 2 Electrical Key Oscillator Circuit Open [12/2024 - ]
- DTC P0335-62: Crankshaft Position Sensor "A" Signal Compare Failure [12/2024 - ]
- DTC P0571-62: Brake Switch "A" Signal Compare Failure [12/2024 - ]
- DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" 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 U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0230-87: Lost Communication with Rear Gate Module Missing Message; DTC U1117-87: Lost Communication with Accessory Gateway Missing Message; DTC U114F-87: Lost Communication with Power Integration Module Missing Message [12/2024 - ]
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.