BYD ATTO 3 (e-Platform 3.0) C11A006 EPB Actuator Overload Fault

C11A006 indicates an overload condition involving the electronic parking brake (EPB) actuator. The fault affects the electric parking brake system, which monitors actuator load during brake application or release and can detect excessive resistance or operating force. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.

Symptoms

• EPB warning light illuminated
• Electronic parking brake warning message
• EPB may fail to apply or release
• Parking brake operation may be slow or abnormal
• EPB motor may stop during operation
• C11A006 stored in the EPB control system
• Parking brake may remain applied
• EPB functions may become temporarily unavailable

Possible Causes

• EPB actuator mechanical binding
• Excessive resistance within the rear brake mechanism
• Seized or restricted EPB motor
• Brake caliper or actuator mechanism binding
• Damaged or incorrectly installed brake components
• Excessive brake pad or rotor resistance
• Electrical resistance in the actuator circuit
• Damaged or corroded EPB connector
• Low or unstable system voltage
• EPB actuator internal fault
• EPB control-module fault

Diagnosis

Diagnosis should begin by confirming C11A006 and determining whether the overload occurs during EPB application, release, or both. EPB actuator data, system voltage, motor current or load information, connector condition, wiring, and the mechanical condition of the rear brake assemblies should then be assessed against manufacturer specifications. The diagnostic direction should distinguish between excessive mechanical resistance and an electrical or actuator fault before components are replaced. For New Zealand owners, confirming the source of actuator overload before replacing EPB 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.