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.
SYS.OK|MANUAL.DB● LIVE
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, HV MODEL)
2025 Toyota Highlander XLE, FWD
SMART KEY SYSTEM (for Start Function, HV Model)
2025 Toyota Highlander XLE, FWDSECTION SMART KEY SYSTEM (for Start Function, HV Model)
SMART KEY SYSTEM (FOR START FUNCTION, HV MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [12/2019 - 10/2021]
| DTC Code | Description |
|---|---|
| B2271 | Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction |
| B2275 | STSW 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 |
| 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 |
| 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 |
| 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 |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
SMART KEY SYSTEM (FOR START FUNCTION, HV MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [10/2021 - 10/2022]
| DTC Code | Description |
|---|---|
| B2271 | Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction |
| B2275 | STSW 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 |
| 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 |
| 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 |
| 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 |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
SMART KEY SYSTEM (FOR START FUNCTION, HV MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [10/2022 - 11/2023]
| DTC Code | Description |
|---|---|
| B2271 | Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction |
| B2275 | STSW 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 |
| 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 |
| 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 |
| 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 |
| U0293 | Lost Communication with Hybrid Vehicle Control System |
SMART KEY SYSTEM (FOR START FUNCTION, HV 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 |
| B2275-11 | Starter Circuit Short to Ground |
| B2275-12 | Starter Circuit Short to Battery |
| 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 |
| P0571-62 | Brake Switch "A" Signal Compare Failure |
| 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 |
| U0293-87 | Lost Communication with Hybrid/EV Powertrain 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
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.