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 MANUALSTOYOTA2025COROLLA CROSS XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXDTC INDEX (4 OF 4)THEFT DETERRENT / KEYLESS ENTRY DTCSSMART KEY SYSTEM (FOR ENTRY FUNCTION, GASOLINE MODEL) (2023-25)
2025 Toyota Corolla Cross XLE, FWD
SMART KEY SYSTEM (for Entry Function, Gasoline Model) (2023-25)
2025 Toyota Corolla Cross XLE, FWDSECTION SMART KEY SYSTEM (for Entry Function, Gasoline Model) (2023-25)
SMART KEY SYSTEM (FOR ENTRY FUNCTION, GASOLINE MODEL) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B27A1-13 | Driver Side Electrical Antenna Circuit Open |
| B27A2-13 | Front Passenger Side Electrical Antenna Circuit Open |
| B27A8-13 | Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open |
| 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 Missing Message |
| U0230-87 | Lost Communication with Rear Gate Module Missing Message |
| U1117-87 | Lost Communication with Accessory Gateway Missing Message |
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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.