EV Diagnostics
Verified EV diagnostic knowledge page

BYD P1A0300

BIC2 working abnormal

DriveUnknown. The supplied verified evidence does not establish whether the vehicle is safe to drive with P1A0300 present.
ChargeUnknown. The supplied verified evidence does not establish whether the vehicle is safe to charge with P1A0300 present.
ServiceService requirement is unknown in the supplied evidence. Because this code is assigned to the HV battery system, seek assessment from a qualified BYD service provider or EV-trained technician.
Confidence95%

Quick answer

For BYD vehicles, DTC P1A0300 is identified as “BIC2 working abnormal.” Verified applicability includes the 2022–2026 ATTO 3, 2021–2026 DOLPHIN, and 2023 HAN in the Global region.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does P1A0300 mean?

For BYD vehicles, DTC P1A0300 is identified as “BIC2 working abnormal.” Verified applicability includes the 2022–2026 ATTO 3, 2021–2026 DOLPHIN, and 2023 HAN in the Global region.

2. Technical explanation

P1A0300 is a BYD HV battery-system diagnostic trouble code. The verified diagnostic description is “BIC2 working abnormal.” The supplied evidence does not define BIC2 further, identify a failure mechanism, or provide diagnostic or repair procedures.

3. What system is affected?

HV battery

4. How serious is this code?

Unknown. The supplied verified evidence does not establish severity.

5. Symptoms you may notice

  • Not yet established by verified evidence.

6. Possible causes

  • Not yet established by verified evidence.

7. Can I still drive the vehicle?

Unknown. The supplied verified evidence does not establish whether the vehicle is safe to drive with P1A0300 present.

8. Can I charge the vehicle?

Unknown. The supplied verified evidence does not establish whether the vehicle is safe to charge with P1A0300 present.

9. What you can safely do

  • Arrange diagnosis by a qualified BYD service provider or EV-trained technician.
  • Do not attempt high-voltage battery inspection, disassembly, or repair based on this code alone.

10. Step-by-step troubleshooting

  1. Confirm the stored DTC with suitable diagnostic equipment.
  2. Further troubleshooting steps are not yet established by verified evidence.

11. When to contact service

Service requirement is unknown in the supplied evidence. Because this code is assigned to the HV battery system, seek assessment from a qualified BYD service provider or EV-trained technician.

12. What the service center may check

  • Not yet established by verified evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Not yet established by verified evidence.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified technical-manual index evidence identifies P1A0300 as “BIC2 working abnormal” for the listed BYD applications. No manufacturer-issued repair procedure, safety instruction, service bulletin, or recall information was supplied.

19. Frequently asked questions

What does BYD code P1A0300 mean?

Verified evidence identifies P1A0300 as “BIC2 working abnormal.”

Which BYD vehicles are covered by the verified evidence?

BYD ATTO 3 model years 2022–2026, BYD DOLPHIN model years 2021–2026, and BYD HAN model year 2023, all for the Global region.

Can I drive with P1A0300?

Not yet established by verified evidence.

Can I charge with P1A0300 present?

Not yet established by verified evidence.

20. Sources & verification

Verified
BYD P1A0300: BIC2 working abnormal | EV Diagnostics