BYD ATTO 3 (e-Platform 3.0) C1066FC SAS Calibration Error

C1066FC indicates a calibration error involving the steering angle sensor (SAS). The fault affects the steering and electronic stability control systems, which use the SAS to determine steering-wheel position and direction for vehicle dynamics calculations. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.

Symptoms

• ESC warning light illuminated
• Steering or stability control warning message
• ABS or traction control warning may appear
• Steering angle data may be incorrect or unavailable
• Electronic stability control functions may be restricted
• C1066FC stored in the vehicle control system
• Fault may appear after wheel alignment or steering repairs
• Warning may remain after restarting the vehicle

Possible Causes

• Steering angle sensor calibration lost or incorrect
• Incorrect steering angle sensor zero-point
• Steering wheel not centred during calibration
• Wheel alignment outside required specifications
• Steering or suspension component replacement
• Steering angle sensor or related module replacement
• Damaged or incorrectly installed sensor
• Loose or damaged electrical connector
• Wiring or communication fault
• Calibration procedure interrupted or performed incorrectly

Diagnosis

Diagnosis should begin by confirming C1066FC and checking the steering angle sensor’s live-data reading with the steering wheel correctly centred. The reported steering angle should be compared with manufacturer specifications, while related wheel-speed, yaw-rate, and stability-control data should be checked for consistency. If calibration is required, the manufacturer’s specified vehicle position, steering-wheel position, diagnostic equipment, and calibration sequence must be followed. Many independent workshops throughout New Zealand rely on OEM diagnostic information to verify calibration-related faults before replacing components.

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.