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, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSDIGITAL KEY SYSTEM - DIAGNOSTIC CODES & SYMPTOM TESTSDIGITAL KEY SYSTEMDTC B27C0-57: DIGITAL KEY SYSTEM INVALID/INCOMPATIBLE SOFTWARE COMPONENT [12/2024 - ]DESCRIPTION
2025 Toyota 4Runner SR5, RWD
DTC B27C0-57: Digital Key System Invalid/Incompatible Software Component [12/2024 - ]: Description
2025 Toyota 4Runner SR5, RWDSECTION Description
This DTC is output when 1 or more electrical key transmitter sub-assemblies are registered and MAC data mismatch was detected 10 times in succession from the digital key computer assembly.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|
| B27C0-57 | Digital Key System Invalid/Incompatible Software Component | 1 or more electrical key transmitter sub-assemblies are registered and MAC data mismatch was detected 10 times in succession from the digital key ECU assembly |
|
Smart Key | A | DTC Output Confirmation Operation:
|
VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED
| Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
|---|---|
| Digital key system does not operate | - |
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.