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Tesla CP_a143

Charging adapter has electric arc flash hazard Use different charging equipment

Common search variants: CPa143 · CP-a143 · CP a143 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNo with the charging equipment implicated by this alert: verified owner-manual evidence states that charging is unavailable and instructs the user to use different charging equipment. Whether charging is available with other equipment is not further established by the supplied evidence.
ServiceNot yet established by verified evidence. The supplied material directs the user to use different charging equipment but does not provide a Tesla Service contact requirement for CP_a143.
Confidence95%

Quick answer

CP_a143 means charging is unavailable because the vehicle detected an electric arc-flash hazard in a third-party adapter used to connect a CCS charge handle to the vehicle charge port. Use different charging equipment.

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 CP_a143 mean?

CP_a143 means charging is unavailable because the vehicle detected an electric arc-flash hazard in a third-party adapter used to connect a CCS charge handle to the vehicle charge port. Use different charging equipment.

2. Technical explanation

Verified Tesla owner-manual material filed by NHTSA states that this alert concerns a third-party Combined Charging System (CCS) charging adapter. The vehicle has detected an electric arc-flash hazard involving that adapter, and charging is unavailable. The supplied evidence does not establish a component-level failure mechanism beyond the detected hazard.

3. What system is affected?

External charging equipment: a third-party adapter used between a CCS charge handle and the Tesla vehicle charge port.

4. How serious is this code?

The database severity value is unknown. However, the verified alert explicitly identifies an electric arc-flash hazard and states that charging is unavailable.

5. Symptoms you may notice

  • CP_a143 alert is displayed.
  • Charging is unavailable.
  • The alert identifies a detected electric arc-flash hazard in the third-party CCS charging adapter.

6. Possible causes

  • The vehicle detected an electric arc-flash hazard in the third-party adapter used to connect a CCS charge handle to the vehicle charge port.
  • Not yet established by verified evidence: the specific electrical, mechanical, environmental, or internal adapter condition that triggered the detection.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

No with the charging equipment implicated by this alert: verified owner-manual evidence states that charging is unavailable and instructs the user to use different charging equipment. Whether charging is available with other equipment is not further established by the supplied evidence.

9. What you can safely do

  • Use different charging equipment, as stated in the verified alert.
  • Do not rely on the third-party CCS adapter identified by the alert for the affected charging attempt.
  • Do not attempt high-voltage or internal adapter repair; no such procedure is established by the supplied evidence.

10. Step-by-step troubleshooting

  1. Use different charging equipment.
  2. Not yet established by verified evidence: further owner-performed diagnostic steps, adapter inspection procedures, reset procedures, or testing methods.

11. When to contact service

Not yet established by verified evidence. The supplied material directs the user to use different charging equipment but does not provide a Tesla Service contact requirement for CP_a143.

12. What the service center may check

  • Not yet established by verified evidence.

13. Possible repair or resolution

  • Use different charging equipment.
  • Not yet established by verified evidence: whether replacement, repair, software action, or vehicle service resolves the alert.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA manufacturer communication MC-10250480-9999 (published 2023-12-01) contains verified owner-manual text for CP_a143: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250480-9999.pdf
  • NHTSA manufacturer communication MC-10253666-9999 (published 2024-03-27) contains verified owner-manual text for CP_a143: https://static.nhtsa.gov/odi/tsbs/2024/MC-10253666-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-filed Tesla owner-manual material identifies CP_a143 as “Charging adapter has electric arc flash hazard Use different charging equipment.” The verified text says charging is unavailable because the vehicle detected an electric arc-flash hazard in the third-party adapter used to connect a CCS charge handle to the vehicle charge port. Sources: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250480-9999.pdf and https://static.nhtsa.gov/odi/tsbs/2024/MC-10253666-9999.pdf. Supplied applicability records cover US Tesla Model 3, Model S, Model X, and Model Y year ranges, with overlapping ranges in the source data; exact applicability for an individual vehicle is not further established by the supplied evidence.

19. Frequently asked questions

What does Tesla alert CP_a143 mean?

It means charging is unavailable because the vehicle detected an electric arc-flash hazard in a third-party adapter used to connect a CCS charge handle to the vehicle charge port.

What should I do when CP_a143 appears?

Use different charging equipment. This is the action stated in the verified alert.

Can I keep using the same CCS adapter?

The verified alert instructs you to use different charging equipment. It does not establish that continued use of the identified third-party adapter is appropriate.

Does CP_a143 mean the vehicle itself has failed?

Not yet established by verified evidence. The verified material identifies a detected hazard in the third-party CCS charging adapter and does not establish a vehicle component failure.

20. Sources & verification

Accepted ResearchVerified
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Tesla CP_a143: Charging adapter has electric arc flash hazard Use… | EV Diagnostics