EV Diagnostics
Verified EV diagnostic knowledge page

Tesla CC_a030

Unable to charge - Primary / paired unit mismatch Wall Connector current ratings must match

Common search variants: CCa030 · CC-a030 · CC a030 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNo at the affected paired Wall Connector load-sharing setup: the alert states that charging is unavailable. Whether the vehicle can charge using other equipment is not established by the CC_a030-specific evidence supplied.
ServiceThe verified Tesla owner-manual material states that service is required if the issue persists.
Confidence95%

Quick answer

Tesla alert CC_a030 means charging is unavailable because paired Wall Connectors in a load-sharing (circuit-breaker-sharing) network have different maximum current capabilities. Tesla states that only Wall Connectors with the same maximum current capabilities can be paired.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

No sufficiently relevant embeddable video has been accepted for this diagnostic yet.

Videos are supporting material and never override OEM or regulator evidence.

1. What does CC_a030 mean?

Tesla alert CC_a030 means charging is unavailable because paired Wall Connectors in a load-sharing (circuit-breaker-sharing) network have different maximum current capabilities. Tesla states that only Wall Connectors with the same maximum current capabilities can be paired.

2. Technical explanation

This is a charging-equipment configuration alert involving a Tesla Wall Connector load-sharing network. Verified Tesla owner-manual material filed with NHTSA states that the paired Wall Connectors have different maximum current capabilities. The evidence does not establish a fault in the vehicle’s high-voltage battery or other vehicle hardware.

3. What system is affected?

Tesla Wall Connector load-sharing (circuit-breaker-sharing) network and its paired Wall Connectors.

4. How serious is this code?

The supplied record lists severity as unknown. The verified alert establishes that charging is unavailable, but does not assign a safety severity.

5. Symptoms you may notice

  • The vehicle displays CC_a030.
  • Charging is unavailable.
  • A paired Wall Connector load-sharing network has Wall Connectors with different maximum current capabilities.

6. Possible causes

  • Paired Wall Connectors in a load-sharing network have different maximum current capabilities.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

No at the affected paired Wall Connector load-sharing setup: the alert states that charging is unavailable. Whether the vehicle can charge using other equipment is not established by the CC_a030-specific evidence supplied.

9. What you can safely do

  • Use only Wall Connectors with the same maximum current capabilities in a load-sharing network.
  • Refer to the installation guide for the Wall Connector.
  • If the issue persists, seek service.

10. Step-by-step troubleshooting

  1. Confirm that the Wall Connectors paired for load sharing have the same maximum current capabilities.
  2. Consult the Wall Connector installation guide for the applicable configuration information.
  3. If the issue persists, service is required.

11. When to contact service

The verified Tesla owner-manual material states that service is required if the issue persists.

12. What the service center may check

  • Verify the maximum current capabilities of each Wall Connector configured as a paired load-sharing network.
  • Verify that only Wall Connectors with matching maximum current capabilities are paired.
  • Follow the applicable Wall Connector installation guide. Further service procedures are not established by verified evidence.

13. Possible repair or resolution

  • Configure the load-sharing pair so that only Wall Connectors with the same maximum current capabilities are paired. Specific repair parts, replacement requirements, and programming procedures are not established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA manufacturer communications containing Tesla owner-manual material document CC_a030, including MC-10250484-9999 (published December 1, 2023) and MC-10253666-9999 (published March 27, 2024). These records describe the alert and refer owners to the Wall Connector installation guide; they do not establish a vehicle-specific repair bulletin.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Tesla manufacturer communication: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250484-9999.pdf

19. Frequently asked questions

What does Tesla code CC_a030 mean?

It means charging is unavailable because paired Wall Connectors in a load-sharing network have different maximum current capabilities.

Can different-current Wall Connectors be paired for load sharing?

No. Tesla’s verified owner-manual material states that only Wall Connectors with the same maximum current capabilities can be paired in a load-sharing network.

Does CC_a030 prove there is a vehicle battery fault?

No. The supplied verified evidence identifies a mismatch between paired Wall Connector current capabilities and does not establish a vehicle battery fault.

Is it safe to drive with CC_a030?

Not yet established by verified evidence.

20. Sources & verification

Accepted ResearchVerified
Show all 58 verified sources
Tesla CC_a030: Unable to charge - Primary / paired unit mismatch Wall… | EV Diagnostics