BYD ATTO 3 (e-Platform 3.0) B227C13 Front Interior Detection Antenna Open Circuit

B227C13 indicates an open circuit has been detected in the front interior detection antenna circuit. The fault affects the smart key and keyless entry system, where interior antennas detect the presence and location of an authorised key inside the vehicle for functions such as key recognition and vehicle access control. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.

Symptoms

• Smart key may not be detected inside the vehicle
• Keyless entry functions may operate incorrectly
• Vehicle may display a smart key detection warning
• Vehicle may fail to recognise the key inside the cabin
• Passive entry or starting functions may be intermittent
• B227C13 stored in the keyless entry control system
• Other smart key antenna faults may be present
• Fault may occur intermittently

Possible Causes

• Open circuit in the front interior detection antenna wiring
• Faulty front interior detection antenna
• Loose or disconnected antenna connector
• Damaged connector terminals
• Corrosion or poor electrical contact
• Damaged wiring within the vehicle interior
• Incorrectly installed or damaged antenna
• Low or unstable 12V system voltage
• Keyless entry control-module fault
• Communication fault affecting antenna operation

Diagnosis

Diagnosis should begin by confirming B227C13 and checking whether the smart key is detected correctly in other areas of the vehicle. The front interior antenna circuit, connector condition, wiring continuity, antenna status, power supply, and relevant control-module communication should then be evaluated against manufacturer specifications. Comparing the affected antenna with other interior detection antennas can help determine whether the fault is isolated to the antenna or its wiring. For New Zealand owners, confirming the antenna circuit before replacing keyless entry components can help avoid unnecessary repair costs.

Accurately diagnosing this fault often requires manufacturer testing procedures, wiring diagrams, connector pinouts, specifications, and system calibration information. Access to the factory service manual significantly reduces diagnostic time and helps prevent unnecessary parts replacement.

Applicable Years

2022, 2023, 2024, 2025, 2026, Onwards

To order the correct OEM Service and Repair Manual for your BYD ATTO 3, submit your request using the form below and our team will provide the ordering details.