BYD ATTO 3 (e-Platform 3.0) Electronic Power Steering Controller CAN Off

Electronic Power Steering Controller CAN Off indicates that the electronic power steering (EPS) controller has lost or stopped receiving required communication over the Controller Area Network (CAN). The fault affects steering assistance and network communication between the EPS controller and other vehicle control modules. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.

Symptoms

• EPS or steering warning light illuminated
• Steering may become heavier than normal
• Reduced or lost power steering assistance
• Steering system warning message displayed
• CAN communication-related diagnostic faults stored
• Intermittent steering assistance
• Other vehicle network or control-module warnings
• Fault may appear after a low-voltage event or electrical repair

Possible Causes

• CAN communication interruption
• Open or short circuit in the CAN wiring
• Loose or damaged CAN connector
• Poor terminal contact
• Corroded or contaminated connector
• EPS controller power or ground supply fault
• Low or unstable 12V system voltage
• CAN bus termination or network fault
• Faulty EPS controller
• Communication fault in another connected control module

Diagnosis

Diagnosis should begin by confirming the EPS communication fault and checking whether other control modules report lost communication with the steering controller. EPS power and ground supplies, CAN-H and CAN-L circuits, connector condition, network communication status, and relevant system voltage should then be assessed against manufacturer specifications.

A network-wide diagnostic scan can help determine whether the EPS controller is the source of the communication loss or is affected by a separate CAN bus fault. For New Zealand owners, confirming the communication circuit before replacing the EPS controller 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.