BYD U20B100
BIC2 CAN communication timeout
Quick answer
U20B100 is a BYD DTC meaning “BIC2 CAN communication timeout.” It is verified 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 U20B100 mean?
U20B100 is a BYD DTC meaning “BIC2 CAN communication timeout.” It is verified for specified BYD ATTO 3, DOLPHIN, and HAN applications.
2. Technical explanation
The verified diagnostic definition identifies a CAN communication timeout involving BIC2. The supplied evidence does not establish the underlying fault cause, operating effects, 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. Safe-to-drive status is not established by verified evidence.
8. Can I charge the vehicle?
Unknown. Safe-to-charge status is not established by verified evidence.
9. What you can safely do
- Do not assume the vehicle is safe to drive or charge based on this code alone.
- Arrange assessment using applicable BYD diagnostic information or qualified service support.
10. Step-by-step troubleshooting
- The verified evidence confirms the DTC definition only. A step-by-step troubleshooting procedure is not yet established by verified evidence.
- Do not perform high-voltage or CAN-network repairs without appropriate qualified service procedures.
11. When to contact service
Service requirement is unknown in the supplied evidence. Because driving and charging status are also unknown, seek qualified BYD service guidance before relying on normal vehicle operation.
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
- Not yet established by verified evidence.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified technical-manual index evidence lists U20B100 as “BIC2 CAN communication timeout” for the applicable BYD vehicle families. No manufacturer-issued repair procedure, 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 U20B100 mean?
It means “BIC2 CAN communication timeout.”
Which vehicles are verified to use U20B100?
The supplied evidence verifies it for BYD ATTO 3 model years 2022–2026, BYD DOLPHIN model years 2021–2026, and BYD HAN model year 2023, all with GLOBAL region applicability.
Can I drive or charge with U20B100?
Not yet established by verified evidence. Both safe-to-drive and safe-to-charge status are recorded as unknown.