BYD P2B7900
Battery pack charging overcurrent alarm
Quick answer
P2B7900 on a BYD ATTO 3 is identified as “Battery pack charging overcurrent alarm.” 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 P2B7900 mean?
P2B7900 on a BYD ATTO 3 is identified as “Battery pack charging overcurrent alarm.” Verified applicability is BYD ATTO 3 model years 2022–2026, global market.
2. Technical explanation
The verified technical-manual evidence defines DTC P2B7900 as a battery-pack charging overcurrent alarm in the HV battery system. The supplied evidence does not establish the triggering conditions, measured values, root cause, or repair procedure.
3. What system is affected?
HV battery
4. How serious is this code?
Unknown. The supplied verified evidence does not assign a severity level.
5. Symptoms you may notice
- A battery pack charging overcurrent alarm is indicated by DTC P2B7900.
- Additional vehicle symptoms are 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 driving is permitted with P2B7900.
8. Can I charge the vehicle?
Unknown. The supplied verified evidence does not establish whether charging is permitted with P2B7900.
9. What you can safely do
- Do not attempt high-voltage battery diagnosis, disassembly, or repair.
- Record the displayed DTC and arrange assessment by a qualified BYD service provider if service is needed.
10. Step-by-step troubleshooting
- Use appropriate diagnostic equipment to confirm and document P2B7900. Further diagnostic steps are not yet established by verified evidence.
- Do not perform high-voltage battery repair procedures based on this information.
11. When to contact service
Service requirement is unknown in the supplied evidence. A qualified BYD service provider can evaluate the HV battery charging-overcurrent alarm using manufacturer-approved procedures.
12. What the service center may check
- Confirm the presence and status of DTC P2B7900. Other 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 as verified evidence.
16. Recall information
- No recalls were supplied as verified evidence.
17. Official manufacturer information
Verified source: OBDTotal technical manual index, “BYD ATTO 3 diagnostic evidence,” locator: ATTO 3 / Yuan Plus (SC2E) / P2B7900. It identifies P2B7900 as “Battery pack charging overcurrent alarm.”
- OBDTotal technical manual index: BYD ATTO 3 diagnostic evidence · technical_manual
19. Frequently asked questions
What does BYD code P2B7900 mean?
It means “Battery pack charging overcurrent alarm.”
Which vehicles are verified as applicable?
BYD ATTO 3, model years 2022 through 2026, global market.
Can the vehicle be driven or charged with P2B7900?
Not yet established by verified evidence.
What causes P2B7900?
Not yet established by verified evidence.