BYD U20B000
BIC1 CAN communication timeout
Quick answer
BYD DTC U20B000 means “BIC1 CAN communication timeout.” It is verified for certain BYD ATTO 3, DOLPHIN, and HAN vehicles listed below.
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 U20B000 mean?
BYD DTC U20B000 means “BIC1 CAN communication timeout.” It is verified for certain BYD ATTO 3, DOLPHIN, and HAN vehicles listed below.
2. Technical explanation
This diagnostic trouble code identifies a CAN communication timeout involving BIC1. The supplied evidence establishes the code meaning only; it does not establish the underlying fault cause, operating conditions, diagnostic steps, or repair procedure.
3. What system is affected?
HV battery/network
4. How serious is this code?
Unknown. Severity has not yet been established by 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 has not yet been established by verified evidence.
8. Can I charge the vehicle?
Unknown. Whether the vehicle can be charged has not yet been established by verified evidence.
9. What you can safely do
- Do not attempt high-voltage battery or CAN-network repairs based on this code alone.
- Arrange professional diagnosis if the code is present or returns after clearing.
10. Step-by-step troubleshooting
- Verified troubleshooting procedures are not provided in the supplied evidence.
11. When to contact service
Service requirement has not yet been established by verified evidence. A qualified BYD service provider can diagnose the stored code using vehicle-specific service information.
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 U20B000 as “BIC1 CAN communication timeout” for the listed BYD applications. Sources: OBDTotal technical manual index, ATTO 3 / Yuan Plus (SC2E), U20B000: https://obdtotal.com/product/byd-atto3-yuanplus-sc2e-service-manual/ ; 17VIN technical manual index, DOLPHIN 2021 family, U20B000: https://en.17vin.com/automotive_repair_manual_wiring_diagrams/BYD/2123.html ; 17VIN technical manual index, HAN 2023 Champion/Supreme family, U20B000: https://en.17vin.com/automotive_repair_manual_wiring_diagrams/BYD/2120.html. Verified applicability: BYD ATTO 3, model years 2022–2026, Global; BYD DOLPHIN, model years 2021–2026, Global; BYD HAN, model year 2023, Global.
- 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 U20B000 mean?
It means “BIC1 CAN communication timeout.”
Which vehicles are verified to use U20B000?
The supplied evidence verifies applicability to BYD ATTO 3 (2022–2026, Global), BYD DOLPHIN (2021–2026, Global), and BYD HAN (2023, Global).
Can I drive with U20B000?
Not yet established by verified evidence.
Can I charge with U20B000?
Not yet established by verified evidence.
What repair fixes U20B000?
Not yet established by verified evidence.