BYD ATTO 3 (e-Platform 3.0) C110009 EPB Controller Main Chip Failure

C110009 indicates a failure involving the main processing chip within the electronic parking brake (EPB) controller. The fault affects EPB control and monitoring functions, with the controller responsible for processing switch commands, actuator operation, and system status information. 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 system warning message
• EPB may fail to apply or release
• EPB operation may become intermittent
• Parking brake functions may be unavailable
• Multiple EPB-related diagnostic trouble codes may be stored
• C110009 stored in the EPB control system
• Vehicle may enter a restricted parking brake operating state

Possible Causes

• Internal EPB controller main-chip failure
• EPB control-module internal electronic fault
• Internal circuit-board failure
• Power supply instability affecting the controller
• Poor controller power or ground connection
• Damaged or corroded controller connector
• Communication fault affecting the EPB controller
• Moisture or contamination inside the controller or connector
• Previous electrical event causing controller damage
• Control-module software or configuration fault

Diagnosis

Diagnosis should begin by confirming C110009 and checking whether other EPB or communication faults are present. Controller power, ground, network communication, connector condition, and relevant system voltage should be verified before concluding that an internal main-chip failure has occurred. If external circuits and communication are confirmed to be within specification, manufacturer procedures may be required to determine whether the EPB controller needs programming, replacement, or further testing. Workshop technicians across New Zealand frequently use factory repair procedures when diagnosing electronic control-module faults like this.

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.