BYD U011187
Communication with BMS failed
Quick answer
BYD DTC U011187 means: Communication with BMS failed. Verified applicability: BYD ATTO 3, model years 2022–2026, Global specification.
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 U011187 mean?
BYD DTC U011187 means: Communication with BMS failed. Verified applicability: BYD ATTO 3, model years 2022–2026, Global specification.
2. Technical explanation
U011187 is a Network diagnostic trouble code. The verified diagnostic meaning is “Communication with BMS failed.” BMS commonly refers to the battery-management system, but the supplied evidence establishes only that communication with the BMS has failed; it does not establish the underlying fault mechanism, affected battery component, or required repair.
3. What system is affected?
Network; communication with BMS.
4. How serious is this code?
Unknown. The supplied verified evidence does not assign a severity level.
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 U011187 present.
8. Can I charge the vehicle?
Unknown. The supplied verified evidence does not establish whether the vehicle is safe to charge with U011187 present.
9. What you can safely do
- Do not attempt high-voltage battery, BMS, wiring, connector, or network repairs based on this code alone.
- Arrange professional diagnosis if the code is present, because the verified fault concerns communication with the BMS.
10. Step-by-step troubleshooting
- Use appropriate professional diagnostic equipment to confirm U011187 and assess the reported BMS communication failure. Specific diagnostic steps are not yet established by verified evidence.
11. When to contact service
Service requirement is unknown in the supplied evidence. Professional diagnosis is appropriate because this code reports failed communication with the BMS.
12. What the service center may check
- Confirm the stored DTC is U011187.
- Assess the reported communication failure with the BMS using suitable professional diagnostic procedures. Further checks are 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
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 source: OBDTotal technical manual index, “BYD ATTO 3 diagnostic evidence,” locator: “ATTO 3 | ATTO 3 / Yuan Plus (SC2E) | U011187.” Source evidence summary: “Communication with BMS failed.”
- OBDTotal technical manual index: BYD ATTO 3 diagnostic evidence · technical_manual
19. Frequently asked questions
What does BYD code U011187 mean?
It means “Communication with BMS failed.”
Which vehicles are verified as applicable?
The supplied evidence verifies BYD ATTO 3 vehicles for model years 2022–2026 in the Global region.
Can I drive or charge with U011187?
Not yet established by verified evidence. The supplied data marks both drive and charge status as unknown.
What repair fixes U011187?
Not yet established by verified evidence.