BYD ATTO 3 (e-Platform 3.0) P1BC500 Front Drive Motor Controller Current Hall Sensor B Fault

P1BC500 indicates a fault involving Current Hall Sensor B in the front drive motor controller. The fault is detected when the controller identifies an abnormal current-sensing signal from Hall Sensor B, potentially affecting accurate motor-current control and causing torque limitation or protective shutdown. The BYD ATTO 3 uses the e-Platform 3.0 architecture and Blade Battery system, with the front drive motor controller monitoring current feedback during propulsion and regenerative operation. BYD diagnostic information specifically identifies P1BC500 as a front drive motor controller Current Hall Sensor B fault.

Symptoms

• Reduced drive power or motor torque
• Powertrain or electric-drive warning appears
• Acceleration may become limited
• Vehicle may enter a protective operating mode
• Regenerative braking may be reduced
• Motor operation may become intermittent
• Vehicle may refuse to enter READY mode
• Multiple motor-controller DTCs may be stored
• Fault may occur during acceleration or high-load operation
• Electric-drive operation may be disabled in severe cases

Possible Causes

• Faulty Current Hall Sensor B
• Abnormal Hall-sensor output signal
• Open circuit in the Hall-sensor wiring
• Short circuit in the sensor circuit
• Loose or damaged motor-controller connector
• Poor terminal contact or excessive resistance
• Damaged wiring harness
• Incorrect sensor power or ground supply
• Internal front drive motor controller fault
• Current-sensing circuit malfunction
• High-voltage or motor-phase fault affecting current measurement

Diagnosis

Diagnosis should begin by confirming P1BC500 and checking for related front drive motor controller, current-sensing, phase-loss, overcurrent, voltage, and communication DTCs. Diagnostic attention should then focus on Hall Sensor B supply, ground and signal integrity, current-sensor data, comparison with the other Hall-sensor channels, connector condition, and motor-controller operating data. BYD diagnostic information separately identifies P1BC900 as Current Hall Sensor A and P1BC600 as Current Hall Sensor C, making the combination of stored codes useful when determining whether the fault is isolated to Sensor B or associated with the controller’s broader current-measurement system.

For New Zealand owners, confirming the Hall-sensor circuit and controller connections before replacing the drive motor 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.

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.

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.