BYD ATTO 3 (e-Platform 3.0) P1BB600 Front Drive Motor Controller High Voltage Overvoltage

P1BB600 indicates that the high-voltage input monitored by the front drive motor controller has exceeded its permitted operating range. The fault is detected when the motor controller identifies excessive high-voltage supply during electric-drive operation, potentially causing torque limitation or protective shutdown of the drive system. The BYD ATTO 3 uses the e-Platform 3.0 architecture and Blade Battery system, with the front drive motor controller monitoring high-voltage supply conditions during propulsion and regenerative operation. BYD diagnostic information specifically identifies P1BB600 as a front drive motor controller high-voltage overvoltage fault.

Symptoms

• Powertrain warning appears
• Reduced drive power or torque
• Acceleration may be limited
• Vehicle may enter a protective operating mode
• Electric motor operation may become intermittent
• Regenerative braking may be reduced
• Vehicle may refuse to enter READY mode
• High-voltage system warning may appear
• Multiple motor-controller or high-voltage DTCs may be stored
• Fault may occur during acceleration or regenerative braking

Possible Causes

• Excessive traction-battery voltage
• High-voltage bus overvoltage
• Abnormal high-voltage battery or BMS output
• Faulty front motor controller voltage-sensing circuit
• Incorrect voltage feedback signal
• Internal motor controller power-electronics fault
• High-voltage wiring or connector problem
• Loose, damaged, or corroded high-voltage terminals
• Regenerative braking voltage abnormality
• Front motor controller control or communication fault
• Associated high-voltage system fault

Diagnosis

Diagnosis should begin by confirming P1BB600 and checking for related front motor-controller, high-voltage battery, voltage-sampling, overcurrent, IGBT, and communication DTCs. Diagnostic attention should then focus on comparing the actual high-voltage battery and DC-bus voltage with the value reported by the front motor controller, while checking voltage-sampling data, operating conditions, connector condition, and related controller faults. BYD diagnostic information places P1BB600 alongside P1BB500 for high-voltage undervoltage and P1BB700 for front motor-controller voltage-sampling failure, making these related codes useful when determining whether the overvoltage is genuine or caused by a sensing fault.

Because this circuit involves the vehicle’s high-voltage drive system, manufacturer safety procedures must be followed before testing high-voltage components. BYD specifies that high-voltage maintenance requires appropriate protective equipment, qualified technicians, and verification that the system has been reduced to a safe voltage before service.

For New Zealand owners, confirming the actual high-voltage supply and controller voltage-sensing signals before replacing the 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.