BYD P1AE400
High-voltage process ended due to abnormal low-voltage supply
Quick answer
BYD DTC P1AE400 means: High-voltage process ended due to abnormal low-voltage supply. Verified applicability is BYD ATTO 3 model years 2022–2026, Global market.
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 P1AE400 mean?
BYD DTC P1AE400 means: High-voltage process ended due to abnormal low-voltage supply. Verified applicability is BYD ATTO 3 model years 2022–2026, Global market.
2. Technical explanation
The verified technical-manual evidence defines P1AE400 as “High-voltage process ended due to abnormal low-voltage supply.” This indicates that a high-voltage process was ended in association with an abnormal low-voltage supply condition. The available evidence does not identify the specific low-voltage component, operating conditions, diagnostic thresholds, or repair procedure.
3. What system is affected?
HV system
4. How serious is this code?
Unknown. Severity is not yet established by verified evidence.
5. Symptoms you may notice
- A high-voltage process ended due to an abnormal low-voltage supply condition, as defined by the verified diagnostic evidence.
6. Possible causes
- Abnormal low-voltage supply condition. Further root causes are not yet established by verified evidence.
7. Can I still drive the vehicle?
Unknown. Whether the vehicle can be driven is not yet established by verified evidence.
8. Can I charge the vehicle?
Unknown. Whether the vehicle can be charged is not yet established by verified evidence.
9. What you can safely do
- Arrange diagnosis by a qualified BYD service provider or appropriately trained EV technician.
- Do not attempt high-voltage-system repair or disassembly based on this code alone.
10. Step-by-step troubleshooting
- A qualified technician should retrieve and assess diagnostic information in accordance with BYD service procedures.
- Specific test steps, measurements, component checks, and acceptance limits are not yet established by verified evidence.
11. When to contact service
Service requirement is unknown in the supplied evidence. Given that the code concerns the HV system and an abnormal low-voltage supply condition, professional diagnosis is appropriate.
12. What the service center may check
- Confirm the presence and status of P1AE400 using suitable diagnostic equipment.
- Follow applicable BYD diagnostic procedures. Detailed service 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
- No technical service bulletins were supplied or established by the verified evidence.
16. Recall information
- No recalls were supplied or established by the verified evidence.
17. Official manufacturer information
Verified source: OBDTotal technical manual index, “BYD ATTO 3 diagnostic evidence,” locator: ATTO 3 / Yuan Plus (SC2E) / P1AE400. https://obdtotal.com/product/byd-atto3-yuanplus-sc2e-service-manual/
- OBDTotal technical manual index: BYD ATTO 3 diagnostic evidence · technical_manual
19. Frequently asked questions
What does BYD P1AE400 mean?
It means “High-voltage process ended due to abnormal low-voltage supply.”
Which vehicles are verified as applicable?
BYD ATTO 3, model years 2022–2026, Global market.
Is it safe to drive with P1AE400?
Not yet established by verified evidence.
Can the vehicle be charged with P1AE400?
Not yet established by verified evidence.
What repair fixes P1AE400?
A specific repair resolution is not yet established by verified evidence.