BYD ATTO 3 (e-Platform 3.0) P1BB100 Front Drive Motor Controller IPM Fault

P1BB100 indicates a fault involving the Intelligent Power Module (IPM) within the front drive motor controller. The fault is detected when the controller identifies an abnormal condition in the IPM power-switching stage used to control current supplied to the front drive motor, potentially causing torque limitation or protective shutdown. The BYD ATTO 3 uses the e-Platform 3.0 architecture and Blade Battery system, with the front motor controller continuously monitoring its power electronics during propulsion and regenerative operation. BYD diagnostic information specifically identifies P1BB100 as a front drive motor controller IPM fault.

Symptoms

• Reduced drive power or motor torque
• Powertrain warning appears
• Electric-drive system warning may be displayed
• Vehicle may enter a protective operating mode
• Acceleration may become limited
• 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

Possible Causes

• Internal IPM failure
• Fault in the motor controller power-switching circuit
• IGBT or power semiconductor malfunction
• IPM temperature-related damage
• Excessive motor or phase current
• High-voltage supply abnormality
• Short circuit in a motor phase circuit
• Damaged high-voltage motor wiring
• Poor connection at the motor controller terminals
• Internal motor controller hardware failure
• IPM control or monitoring circuit fault
• Secondary failure caused by another motor-controller fault

Diagnosis

Diagnosis should begin by confirming P1BB100 and checking for related motor-controller DTCs, particularly overcurrent, high-voltage, IGBT temperature, IPM temperature, phase-loss, current-sensor, and CPLD faults. Diagnostic attention should then focus on the controller’s IPM status, high-voltage supply, motor phase-current data, temperature information, and associated high-voltage connections. BYD diagnostic information lists P1BB100 alongside P1BF100 for abnormal IPM temperature sampling and P1BC700 for an IPM radiator overtemperature fault, while related P1BD-series codes cover CPLD overcurrent, overvoltage and IGBT bridge detection faults.

Because P1BB100 can occur alongside other power-electronics faults, the motor controller should not automatically be condemned without checking the associated motor, high-voltage supply, current-sensing, temperature and phase circuits.

For New Zealand owners, confirming the associated motor-controller and high-voltage circuits before replacing the drive unit 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.