BYD U20B700
BIC8 CAN communication timeout
Quick answer
U20B700 is a BYD diagnostic trouble code for “BIC8 CAN communication timeout.” It is documented for specified BYD ATTO 3, DOLPHIN, and HAN applications.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does U20B700 mean?
U20B700 is a BYD diagnostic trouble code for “BIC8 CAN communication timeout.” It is documented for specified BYD ATTO 3, DOLPHIN, and HAN applications.
2. Technical explanation
The verified diagnostic meaning of U20B700 is BIC8 CAN communication timeout. This identifies a timeout condition involving CAN communication and BIC8 within the HV battery/network system. The supplied evidence does not establish the underlying fault cause, affected vehicle behavior, diagnostic procedure, or repair method.
3. What system is affected?
HV battery/network
4. How serious is this code?
Unknown. Severity is not established by the verified evidence.
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. Whether the vehicle can be driven is not established by verified evidence.
8. Can I charge the vehicle?
Unknown. Whether the vehicle can be charged is not established by verified evidence.
9. What you can safely do
- Do not perform high-voltage battery or network repairs based solely on this code.
- Have the code assessed using appropriate BYD diagnostic information and service support.
10. Step-by-step troubleshooting
- Verified troubleshooting steps are not yet established by the supplied evidence.
11. When to contact service
Service requirement is unknown in the supplied evidence. If U20B700 is present, seek assessment by a qualified BYD service provider, particularly if vehicle operation or charging is affected.
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
- BYD ATTO 3 · 2022–2026 · GLOBAL
- BYD DOLPHIN · 2021–2026 · GLOBAL
- BYD HAN · 2023 · GLOBAL
15. Related TSBs / service bulletins
- No technical service bulletins were supplied as verified evidence.
16. Recall information
- No recalls were supplied as verified evidence.
17. Official manufacturer information
Verified technical-manual index evidence identifies U20B700 as “BIC8 CAN communication timeout” for BYD applications listed below. No manufacturer-issued repair procedure, safety instruction, bulletin, or recall information was supplied.
- 17VIN technical manual index: BYD DOLPHIN diagnostic evidence · technical_manual
- 17VIN technical manual index: BYD HAN diagnostic evidence · technical_manual
- OBDTotal technical manual index: BYD ATTO 3 diagnostic evidence · technical_manual
19. Frequently asked questions
What does BYD code U20B700 mean?
It means “BIC8 CAN communication timeout.”
Which vehicles are supported by the supplied evidence?
BYD ATTO 3 model years 2022–2026 globally; BYD DOLPHIN model years 2021–2026 globally; and BYD HAN model year 2023 globally, within the listed evidence scope.
Can I drive with U20B700?
Not yet established by verified evidence.
Can I charge with U20B700?
Not yet established by verified evidence.
What repair fixes U20B700?
Not yet established by verified evidence.