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Tesla CC_a026

Unable to charge - Wall Connector issue Wall Connector needs service

Common search variants: CCa026 · CC-a026 · CC a026 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeThe alert states that charging is unavailable through the affected Wall Connector. Whether the vehicle can charge using another charging source is not yet established by verified evidence.
ServiceContact Wall Connector service if CC_a026 persists after the applicable installation guidance has been followed and power has been restored. The supplied evidence directs users to the Wall Connector installation guide for more information.
Confidence95%

Quick answer

Tesla alert CC_a026 means the vehicle detected a Wall Connector hardware issue and charging may be unavailable. If the issue persists after the applicable Wall Connector installation guidance is followed and power is restored, the Wall Connector requires service.

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 CC_a026 mean?

Tesla alert CC_a026 means the vehicle detected a Wall Connector hardware issue and charging may be unavailable. If the issue persists after the applicable Wall Connector installation guidance is followed and power is restored, the Wall Connector requires service.

2. Technical explanation

Verified Tesla owner-manual material filed with NHTSA identifies CC_a026 as: “Unable to charge - Wall Connector issue Wall Connector needs service.” It states that an internal issue was detected by the Wall Connector. The evidence identifies possible Wall Connector hardware issues as a non-working contactor, a failed self-test of the internal ground-fault monitoring circuit, a disconnected thermal sensor, or another hardware-component issue. These are possible issues, not a confirmed diagnosis for any individual installation.

3. What system is affected?

Tesla Wall Connector charging equipment.

4. How serious is this code?

Unknown. The supplied diagnostic record does not establish a severity level.

5. Symptoms you may notice

  • The vehicle displays CC_a026: “Unable to charge - Wall Connector issue Wall Connector needs service.”
  • Charging is unavailable through the affected Wall Connector.

6. Possible causes

  • Wall Connector contactor not working.
  • Wall Connector internal ground-fault monitoring circuit self-test failed.
  • Wall Connector thermal sensor disconnected.
  • Another Wall Connector hardware-component issue.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

The alert states that charging is unavailable through the affected Wall Connector. Whether the vehicle can charge using another charging source is not yet established by verified evidence.

9. What you can safely do

  • Use the Wall Connector installation guide for the applicable Wall Connector.
  • If electrical work is required, have an electrician complete the work in accordance with the Wall Connector Installation Manual.
  • After the electrician has completed the work and restored power to the Wall Connector, reconnect the Wall Connector to the vehicle and try charging again.
  • Do not attempt internal Wall Connector repair based on this alert.

10. Step-by-step troubleshooting

  1. Follow the applicable Wall Connector Installation Manual guidance.
  2. After electrical work has been completed and power restored by an electrician, reconnect the Wall Connector to the vehicle and try charging again.
  3. If the issue persists, the Wall Connector requires service.

11. When to contact service

Contact Wall Connector service if CC_a026 persists after the applicable installation guidance has been followed and power has been restored. The supplied evidence directs users to the Wall Connector installation guide for more information.

12. What the service center may check

  • Evaluate the Wall Connector for the internal issue indicated by CC_a026.
  • Assess the possible hardware conditions identified in the Tesla material: contactor operation, internal ground-fault monitoring self-test status, thermal-sensor connection, and other Wall Connector hardware-component issues.
  • Perform any electrical work in accordance with the applicable Wall Connector Installation Manual.

13. Possible repair or resolution

  • If the issue persists after applicable installation guidance and restoration of power, the verified Tesla material states that the Wall Connector requires service.
  • The specific repair or replacement outcome is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA manufacturer communication MC-10250480 (published December 1, 2023) contains Tesla owner-manual information for CC_a026, including possible Wall Connector hardware issues and the direction that persistent issues require Wall Connector service: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250480-9999.pdf
  • NHTSA manufacturer communication MC-10253666 (published March 27, 2024) also includes CC_a026 guidance stating that a persistent issue requires Wall Connector service: 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 material describes CC_a026 as a Wall Connector hardware issue. Verified US applicability records cover Tesla Model 3 (2013-2024), Model S (2012-2024), Model X (2016-2024), and Model Y (2020-2024), with overlapping year ranges in the source data. Applicability to a specific vehicle and Wall Connector configuration is not further established by the supplied evidence.

19. Frequently asked questions

What does Tesla CC_a026 mean?

It means “Unable to charge - Wall Connector issue Wall Connector needs service.” Tesla material says an internal issue was detected by the Wall Connector.

What can cause CC_a026?

Verified possible issues are a non-working contactor, failed self-test of the internal ground-fault monitoring circuit, a disconnected thermal sensor, or another Wall Connector hardware-component issue.

What should I do if CC_a026 remains after trying again?

The Tesla material states that if the issue persists after applicable installation guidance and restoration of power, the Wall Connector requires service.

Can I drive with CC_a026?

Not yet established by verified evidence.

20. Sources & verification

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Tesla CC_a026: Unable to charge - Wall Connector issue Wall Connector… | EV Diagnostics