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BYD C117009

EPB switch fault

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService requirement is not established by verified evidence; however, professional EPB diagnosis is appropriate because the verified fault concerns the parking-brake switch.
Confidence95%

Quick answer

DTC C117009 means “EPB switch fault” for the BYD ATTO 3 (2022–2026, Global).

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 C117009 mean?

DTC C117009 means “EPB switch fault” for the BYD ATTO 3 (2022–2026, Global).

2. Technical explanation

Verified evidence identifies C117009 as an electronic parking brake (EPB) switch fault. The supplied evidence does not establish the exact failure mechanism, test procedure, wiring location, or repair method.

3. What system is affected?

Electronic Parking Brake (EPB) system.

4. How serious is this code?

Unknown. Severity is not established by verified evidence.

5. Symptoms you may notice

  • An EPB switch fault is indicated by DTC C117009. Other symptoms are not yet established by verified evidence.

6. Possible causes

  • EPB switch fault.
  • Specific underlying causes are 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 professional diagnosis of the EPB system.
  • Do not attempt high-voltage or electrical repairs based on this code alone.
  • Follow the vehicle’s warnings and owner documentation.

10. Step-by-step troubleshooting

  1. Confirm the stored diagnostic code is C117009.
  2. Have a qualified service provider diagnose the EPB switch fault.
  3. Further diagnostic steps are not yet established by verified evidence.

11. When to contact service

Service requirement is not established by verified evidence; however, professional EPB diagnosis is appropriate because the verified fault concerns the parking-brake switch.

12. What the service center may check

  • Confirm C117009 with suitable diagnostic equipment.
  • Specific service 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

  • No technical service bulletin information was supplied in the verified evidence.

16. Recall information

  • No recall information was supplied in the verified evidence.

17. Official manufacturer information

Verified source: OBDTotal technical manual index, “BYD ATTO 3 diagnostic evidence,” locator: ATTO 3 / Yuan Plus (SC2E) / C117009. Applicability supplied: BYD ATTO 3, model years 2022–2026, Global.

19. Frequently asked questions

What does BYD code C117009 mean?

It means “EPB switch fault.”

Which vehicles are covered by the supplied evidence?

BYD ATTO 3 vehicles for model years 2022–2026 in the Global region.

Is it safe to drive with C117009?

Not yet established by verified evidence.

Can the vehicle be charged with C117009?

Not yet established by verified evidence.

20. Sources & verification

Verified
BYD C117009: EPB switch fault | EV Diagnostics