C051D01 indicates a calibration error involving the yaw rate sensor used by the vehicle stability control system. The sensor measures the vehicle’s rotational movement around its vertical axis, allowing the stability control system to compare actual vehicle motion with the driver’s intended direction. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.
C051200 indicates an open circuit involving the right rear wheel speed sensor circuit. The fault affects the ABS and wheel-speed monitoring system, which uses individual wheel-speed signals to support ABS, traction control, electronic stability control, and related vehicle functions. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.
C050C00 indicates an open circuit involving the left rear wheel speed sensor circuit. The fault affects the ABS and wheel-speed monitoring system, which uses individual wheel-speed signals to support ABS, traction control, electronic stability control, and related vehicle functions. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.
C050600 indicates an open circuit involving the right front wheel speed sensor circuit. The fault affects the ABS and wheel-speed monitoring system, which uses individual wheel-speed signals to support ABS, traction control, electronic stability control, and related vehicle functions. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.
C050000 indicates an open circuit involving the left front wheel speed sensor circuit. The fault affects the ABS and wheel-speed monitoring system, which uses sensor signals to determine individual wheel rotation and support functions such as ABS, traction control, and vehicle stability control. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.
C004900 indicates that the brake fluid level has fallen below the expected threshold detected by the brake fluid level monitoring system. The fault affects the brake hydraulic system and may be triggered when the level sensor or associated control system detects insufficient fluid in the reservoir. The BYD ATTO 3 uses BYD’s e-Platform 3.0 architecture, with this generation introduced from 2022 and continuing onward.
P056300 indicates that the vehicle’s monitored system voltage has exceeded the permitted operating range. BYD diagnostic information for the ATTO 3 specifically lists P056300 as “System Voltage is too high.”
P056200 indicates that the vehicle’s system voltage has fallen below the permitted operating range. On the BYD ATTO 3, this is primarily associated with the low-voltage electrical supply and can affect multiple electronic control modules when the available 12V supply becomes insufficient. BYD repair information for the ATTO 3/Yuan Plus lists P056200 specifically as “System voltage is too low.”
A low-voltage condition can originate from the 12V battery, DC/DC converter, wiring, connections, grounding, or an excessive electrical load. The ATTO 3’s owner’s manual also identifies low-voltage battery over-discharge as a condition that can prevent normal charging operation and recommends restoring the low-voltage battery supply when necessary.
P1BC100 indicates that the front drive motor controller has detected a reduced or weakened resolver signal amplitude. The resolver provides rotor-position information to the motor controller, and insufficient signal amplitude can prevent the controller from accurately determining motor position. This may result in torque limitation, reduced drive performance, or protective shutdown of the electric drive system. BYD diagnostic references specifically identify P1BC100 as a front drive motor resolver fault involving weakened signal amplitude.
P1BBF00 indicates that the front drive motor controller has detected a loss of the resolver signal from the front drive motor. The resolver provides the motor controller with rotor-position information required for accurate motor control. If the signal is lost, the controller may be unable to determine the rotor’s position correctly, resulting in torque limitation, protective operation, or disabling of the electric drive system. BYD diagnostic references specifically identify P1BBF00 as a front drive motor resolver signal-loss fault.
