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)QUICK LOOKUPSDTC INDEXDTC INDEX (6 OF 6)THEFT DETERRENT / KEYLESS ENTRY DTCSSMART KEY SYSTEM (FOR START FUNCTION, GASOLINE MODEL)
2025 Toyota Highlander XLE, FWD
SMART KEY SYSTEM (for Start Function, Gasoline Model)
2025 Toyota Highlander XLE, FWDSECTION SMART KEY SYSTEM (for Start Function, Gasoline Model)
SMART KEY SYSTEM (FOR START FUNCTION, GASOLINE MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [12/2019 - 10/2021]
| DTC Code | Description |
|---|---|
| B2271 | Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction |
| B2277 | Detecting Vehicle Submersion |
| B2278 | Engine/Power Switch Malfunction |
| B2282 | Vehicle Speed Signal Malfunction |
| B2283 | Vehicle Speed Sensor Malfunction |
| B2284 | Brake Signal Malfunction |
| B2285 | Steering Lock Position Signal Circuit Malfunction |
| B2286 | Runnable Signal Malfunction |
| B228A | Engine Speed Signal Circuit |
| B228B | System Voltage or GND Energization Malfunction |
| B2779 | Engine Starter Communication Malfunction |
| B2781 | Open / Short in Steering Lock ECU |
| B2782 | Power Source Control ECU Malfunction |
| B2784 | Antenna Coil Open / Short |
| B2788 | IG2 Signal Malfunction |
| B278A | Short to GND in Immobiliser System Power Source Circuit |
| B278D | Malfunction of ID-BOX Recognition |
| B2799-86 | Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid |
| B279A-12 | Engine Immobiliser System Circuit Short to Battery |
| B279C-95 | Engine Immobiliser System Incorrect Assembly |
| B27A5 | Open in Front Floor Electrical Key Oscillator Circuit |
| B27A6 | Open in Rear Floor Electrical Key Oscillator Circuit |
| B27A7 | Open in Inside Luggage Compartment Electrical Key Oscillator Circuit |
| P0335 | Crankshaft Position Sensor Circuit Malfunction (NE Signal) |
| U0100 | Lost Communication with ECM / PCM |
| U0140 | Lost Communication with Main Body ECU |
| U0142 | Lost Communication with Main Body ECU |
| U0155 | Lost Communication with Combination Meter |
SMART KEY SYSTEM (FOR START FUNCTION, GASOLINE MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [10/2021 - 10/2022]
| DTC Code | Description |
|---|---|
| B2271 | Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction |
| B2277 | Detecting Vehicle Submersion |
| B2278 | Engine/Power Switch Malfunction |
| B2282 | Vehicle Speed Signal Malfunction |
| B2283 | Vehicle Speed Sensor Malfunction |
| B2284 | Brake Signal Malfunction |
| B2285 | Steering Lock Position Signal Circuit Malfunction |
| B2286 | Runnable Signal Malfunction |
| B228A | Engine Speed Signal Circuit |
| B228B | System Voltage or GND Energization Malfunction |
| B2779 | Engine Starter Communication Malfunction |
| B2781 | Open / Short in Steering Lock ECU |
| B2782 | Power Source Control ECU Malfunction |
| B2784 | Antenna Coil Open / Short |
| B2788 | IG2 Signal Malfunction |
| B278A | Short to GND in Immobiliser System Power Source Circuit |
| B278D | Malfunction of ID-BOX Recognition |
| B2790 | ID BOX EEPROM Malfunction |
| B2799-86 | Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid |
| B279A-12 | Engine Immobiliser System Circuit Short to Battery |
| B279C-95 | Engine Immobiliser System Incorrect Assembly |
| B27A5 | Open in Front Floor Electrical Key Oscillator Circuit |
| B27A6 | Open in Rear Floor Electrical Key Oscillator Circuit |
| B27A7 | Open in Inside Luggage Compartment Electrical Key Oscillator Circuit |
| P0335 | Crankshaft Position Sensor Circuit Malfunction (NE Signal) |
| U0100 | Lost Communication with ECM / PCM |
| U0140 | Lost Communication with Main Body ECU |
| U0142 | Lost Communication with Main Body ECU |
| U0155 | Lost Communication with Combination Meter |
| U0230 | Lost Communication with Rear Gate Module |
| U1103 | Lost Communication with Stop and Start Control Module |
SMART KEY SYSTEM (FOR START FUNCTION, GASOLINE MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [10/2022 - 11/2023]
| DTC Code | Description |
|---|---|
| B2271 | Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction |
| B2277 | Detecting Vehicle Submersion |
| B2278 | Engine/Power Switch Malfunction |
| B2282 | Vehicle Speed Signal Malfunction |
| B2283 | Vehicle Speed Sensor Malfunction |
| B2284 | Brake Signal Malfunction |
| B2285 | Steering Lock Position Signal Circuit Malfunction |
| B2286 | Runnable Signal Malfunction |
| B228A | Engine Speed Signal Circuit |
| B228B | System Voltage or GND Energization Malfunction |
| B2779 | Engine Starter Communication Malfunction |
| B2781 | Open / Short in Steering Lock ECU |
| B2782 | Power Source Control ECU Malfunction |
| B2784 | Antenna Coil Open / Short |
| B2788 | IG2 Signal Malfunction |
| B278A | Short to GND in Immobiliser System Power Source Circuit |
| B278D | Malfunction of ID-BOX Recognition |
| B2790 | ID BOX EEPROM Malfunction |
| B2799-86 | Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid |
| B279A-12 | Engine Immobiliser System Circuit Short to Battery |
| B279C-95 | Engine Immobiliser System Incorrect Assembly |
| B27A5 | Open in Front Floor Electrical Key Oscillator Circuit |
| B27A6 | Open in Rear Floor Electrical Key Oscillator Circuit |
| B27A7 | Open in Inside Luggage Compartment Electrical Key Oscillator Circuit |
| P0335 | Crankshaft Position Sensor Circuit Malfunction (NE Signal) |
| U0100 | Lost Communication with ECM / PCM |
| U0140 | Lost Communication with Main Body ECU |
| U0142 | Lost Communication with Main Body ECU |
| U0155 | Lost Communication with Combination Meter |
| U0230 | Lost Communication with Rear Gate Module |
| U1103 | Lost Communication with Stop and Start Control Module |
SMART KEY SYSTEM (FOR START FUNCTION, GASOLINE MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [11/2023 - ]
| DTC Code | Description |
|---|---|
| B2271-11 | IG Circuit Short to Ground |
| B2274-11 | ACC Circuit Short to Ground |
| B2278-62 | Engine/Power Switch Signal Compare Failure |
| B2282-31 | Vehicle Speed Signal Circuit Open |
| B2282-62 | Vehicle Speed Signal Compare Failure |
| B2285-62 | Steering Lock Position Signal Compare Failure |
| B228B-00 | Battery Circuit or Ground Circuit Energization Malfunction |
| B277A-96 | Wireless Starter Component Internal Failure |
| B2781-96 | Steering Lock System Component Internal Failure |
| B2782-11 | Power Source Control System Circuit Short to Ground |
| B2782-15 | Power Source Control System Circuit Short to Battery or Open |
| B2784-1C | Antenna Coil Circuit Voltage Out of Range |
| B278D-96 | ID-BOX Component Internal Failure |
| B278E-87 | Immobiliser Amp Missing Message |
| B2790-46 | ID-BOX Calibration / Parameter Memory Failure |
| B2799-86 | Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid |
| B279A-12 | Engine Immobiliser System Circuit Short to Battery |
| B279C-95 | Engine Immobiliser System Incorrect Assembly |
| B279F-1C | Steering Lock Confirmation Signal Circuit Voltage Out of Range |
| B27A5-13 | Front Floor Electrical Key Oscillator Circuit Open |
| B27A6-13 | Rear Floor Electrical Key Oscillator Circuit Open |
| B27A7-13 | Rear Floor 2 Electrical Key Oscillator Circuit Open |
| P0335-62 | Crankshaft Position Sensor "A" Signal Compare Failure |
| P0571-62 | Brake Switch "A" Signal Compare Failure |
| U0100-87 | Lost Communication With ECM/PCM "A" Missing Message |
| U0129-87 | Lost Communication with Brake System Control Module "A" Missing Message |
| U0140-87 | Lost Communication with Body Control Module Missing Message |
| U0155-87 | Lost Communication with Instrument Panel Cluster (IPC) Control Module |
| U0163-87 | Lost Communication with Navigation Control Module Missing Message |
| U0230-87 | Lost Communication with Rear Gate Module Missing Message |
| U1103-87 | Lost Communication with Stop and Start Control Module Missing Message |
| U1110-87 | Lost Communication with Intuitive Parking Assist Module Missing Message |
| U1117-87 | Lost Communication with Accessory Gateway Missing Message |
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.