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BYD P2B7300

Temperature sampling disconnected - serious fault

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceProfessional EV service is appropriate because P2B7300 is identified as a serious HV-battery temperature-sampling fault. Whether service is mandatory is not separately established by verified evidence.
Confidence95%

Quick answer

BYD DTC P2B7300 means “Temperature sampling disconnected - serious fault” in the HV battery system. Verified applicability includes specified BYD ATTO 3, DOLPHIN, and HAN model years.

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 P2B7300 mean?

BYD DTC P2B7300 means “Temperature sampling disconnected - serious fault” in the HV battery system. Verified applicability includes specified BYD ATTO 3, DOLPHIN, and HAN model years.

2. Technical explanation

The verified diagnostic evidence identifies P2B7300 as an HV-battery-related DTC for a serious temperature-sampling disconnection fault. The evidence does not further identify the affected battery component, circuit location, operating conditions, symptoms, or diagnostic procedure.

3. What system is affected?

High-voltage (HV) battery.

4. How serious is this code?

The canonical diagnostic title and meaning explicitly describe this as a “serious fault.” A separate severity rating is not provided by the verified evidence.

5. Symptoms you may notice

  • Not yet established by verified evidence.

6. Possible causes

  • A temperature-sampling disconnection is identified by the DTC meaning.
  • The specific failed component, wiring location, connector, sensor, or underlying reason for the disconnection 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

  • Do not attempt high-voltage battery diagnosis, disassembly, or repair without appropriate qualified EV service procedures.
  • Arrange professional diagnosis because the verified DTC describes a serious HV-battery temperature-sampling fault.

10. Step-by-step troubleshooting

  1. Have a qualified EV service provider retrieve and assess DTC P2B7300 using suitable diagnostic equipment.
  2. Further troubleshooting steps are not yet established by verified evidence.

11. When to contact service

Professional EV service is appropriate because P2B7300 is identified as a serious HV-battery temperature-sampling fault. Whether service is mandatory is not separately established by verified evidence.

12. What the service center may check

  • Confirm the presence and status of DTC P2B7300.
  • Specific inspection, measurement, test, and repair checks are not yet established by verified evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

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 technical-manual index evidence lists P2B7300 as “Temperature sampling disconnected - serious fault” for the applicable BYD vehicles. Sources: OBDTotal technical manual index, ATTO 3 / Yuan Plus (SC2E), locator “P2B7300”: https://obdtotal.com/product/byd-atto3-yuanplus-sc2e-service-manual/ ; 17VIN technical manual index, DOLPHIN 2021 family, locator “P2B7300”: https://en.17vin.com/automotive_repair_manual_wiring_diagrams/BYD/2123.html ; 17VIN technical manual index, HAN 2023 Champion/Supreme family, locator “P2B7300”: https://en.17vin.com/automotive_repair_manual_wiring_diagrams/BYD/2120.html.

19. Frequently asked questions

What does BYD code P2B7300 mean?

It means “Temperature sampling disconnected - serious fault” in the HV battery system.

Which vehicles are supported by the verified evidence?

BYD ATTO 3 model years 2022–2026 globally, BYD DOLPHIN model years 2021–2026 globally, and BYD HAN model year 2023 globally.

Can I drive or charge with P2B7300?

Not yet established by verified evidence.

What repair fixes P2B7300?

Not yet established by verified evidence.

20. Sources & verification

Verified
BYD P2B7300: Temperature sampling disconnected - serious fault | EV Diagnostics