BYD B2AB149
Electric compressor motor phase loss
Quick answer
DTC B2AB149 means “Electric compressor motor phase loss” in the HVAC compressor system. Verified evidence supports this meaning for specified BYD SEAL and SEALION 7 vehicles only.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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 B2AB149 mean?
DTC B2AB149 means “Electric compressor motor phase loss” in the HVAC compressor system. Verified evidence supports this meaning for specified BYD SEAL and SEALION 7 vehicles only.
2. Technical explanation
The verified diagnostic meaning of B2AB149 is electric compressor motor phase loss, also described in a technical-manual index as compressor motor phase failure. The supplied evidence does not establish the underlying failed component, operating conditions, fault-confirmation criteria, or a repair procedure.
3. What system is affected?
HVAC compressor; specifically, the electric compressor motor phase function.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- Not yet established by verified evidence.
6. Possible causes
- Electric compressor motor phase loss is the verified fault meaning.
- The specific cause of the phase loss is not yet established by verified evidence.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Arrange diagnosis by a qualified BYD service provider or suitably trained EV technician.
- Do not attempt high-voltage HVAC compressor or electrical-system repairs yourself.
10. Step-by-step troubleshooting
- Use an appropriate diagnostic tool to confirm the stored DTC and record associated diagnostic information. Further test steps are not yet established by verified evidence.
- Diagnosis of the electric compressor motor phase function should be performed by qualified personnel; no component-level test procedure is established by the supplied evidence.
11. When to contact service
Service requirement is not yet established by verified evidence. However, because this code concerns the electric HVAC compressor motor phase function, qualified EV service diagnosis is appropriate.
12. What the service center may check
- Confirm DTC B2AB149 and its status with an appropriate diagnostic tool.
- No further verified service checks were supplied.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- BYD SEAL · 2022–2026 · GLOBAL
- BYD SEALION 7 · 2024 · 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 sources: 17VIN technical manual index, “BYD SEALION 7 diagnostic evidence,” locator: “SEALION 7 | Sealion 07 EV / 2024 | B2AB149,” describing compressor motor phase failure; and Indexed technical document, “BYD SEAL diagnostic evidence,” locator: “SEAL | European technical-training vehicle | B2AB149,” describing electric compressor motor phase loss.
- 17VIN technical manual index: BYD SEALION 7 diagnostic evidence · technical_manual
- Indexed technical document: BYD SEAL diagnostic evidence · technical_manual
19. Frequently asked questions
What does BYD code B2AB149 mean?
Verified evidence identifies B2AB149 as “Electric compressor motor phase loss,” also described as compressor motor phase failure.
Which vehicles are supported by the supplied evidence?
BYD SEAL, model years 2022–2026, Global region; and BYD SEALION 7, model year 2024, Global region.
Can I drive or charge with B2AB149?
Not yet established by verified evidence.
What repair fixes B2AB149?
Not yet established by verified evidence.