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Tesla CC_a024

Unable to charge - Low Wall Connector current Primary unit current setting must be increased

Common search variants: CCa024 · CC-a024 · CC a024 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNo at the affected Wall Connector while CC_a024 is present; the alert states “Unable to charge.” Charging capability at other charging equipment is not yet established by verified evidence.
ServiceContact a qualified electrician for the Wall Connector configuration. Whether Tesla Service is required is not yet established by verified evidence.
Confidence95%

Quick answer

Tesla alert CC_a024 means charging is unavailable because the Wall Connector primary unit is set to too low a current. Verified information identifies an incorrect Wall Connector internal rotary-switch setting as the cause and directs that a qualified electrician set it to a valid operating-current setting.

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_a024 mean?

Tesla alert CC_a024 means charging is unavailable because the Wall Connector primary unit is set to too low a current. Verified information identifies an incorrect Wall Connector internal rotary-switch setting as the cause and directs that a qualified electrician set it to a valid operating-current setting.

2. Technical explanation

The verified Tesla owner-manual material submitted through NHTSA describes CC_a024 as: “Unable to charge - Low Wall Connector current. Primary unit current setting must be increased.” It states that the alert means the Wall Connector has an incorrect rotary-switch setting. The required correction is at the Wall Connector installation, not a vehicle high-voltage repair.

3. What system is affected?

Tesla Wall Connector primary-unit current configuration, specifically its internal rotary-switch setting.

4. How serious is this code?

Charging is unavailable according to the alert. Overall severity is not yet established by verified evidence.

5. Symptoms you may notice

  • The vehicle displays CC_a024.
  • Charging is unavailable.
  • The alert identifies low Wall Connector current and says the primary-unit current setting must be increased.

6. Possible causes

  • Incorrect Wall Connector internal rotary-switch setting.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

No at the affected Wall Connector while CC_a024 is present; the alert states “Unable to charge.” Charging capability at other charging equipment is not yet established by verified evidence.

9. What you can safely do

  • Consult a qualified electrician.
  • Use the Wall Connector installation guide for the applicable installation.

10. Step-by-step troubleshooting

  1. Have a qualified electrician verify the Wall Connector’s internal rotary-switch setting.
  2. The electrician should set the switch to a valid operating-current setting in accordance with the Wall Connector installation guidance.
  3. The verified instruction states that there must be no power to the Wall Connector before the electrician performs the adjustment.

11. When to contact service

Contact a qualified electrician for the Wall Connector configuration. Whether Tesla Service is required is not yet established by verified evidence.

12. What the service center may check

  • Verify that the Wall Connector primary unit’s internal rotary switch is set to a valid operating-current setting.
  • Ensure the Wall Connector is de-energized before a qualified electrician adjusts its internal rotary switch.
  • Refer to the Wall Connector installation guide.

13. Possible repair or resolution

  • A qualified electrician adjusts the Wall Connector internal rotary switch to a valid operating-current setting, with power removed first.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Official NHTSA-hosted Tesla manufacturer communications document this alert, including MC-10253666-9999 (published March 27, 2024), MC-10250480-9999 (published December 1, 2023), and MC-10240947-9999 (published June 9, 2023). These documents describe the same incorrect rotary-switch setting and electrician-directed correction.
  • Source: https://static.nhtsa.gov/odi/tsbs/2024/MC-10253666-9999.pdf
  • Source: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250480-9999.pdf
  • Source: https://static.nhtsa.gov/odi/tsbs/2023/MC-10240947-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified applicability is Tesla Model 3 model years 2013-2024, Model S model years 2012-2024, Model X model years 2016-2024, and Model Y model years 2020-2024 in the US; the supplied applicability entries overlap by year range. Official NHTSA-hosted Tesla material: https://static.nhtsa.gov/odi/tsbs/2024/MC-10253666-9999.pdf

19. Frequently asked questions

What does Tesla CC_a024 mean?

It means charging is unavailable because Wall Connector current is low and the primary-unit current setting must be increased.

What verified cause is associated with CC_a024?

The verified material identifies an incorrect Wall Connector internal rotary-switch setting.

Who should correct CC_a024?

The verified instruction is to have a qualified electrician adjust the Wall Connector internal rotary switch to a valid operating-current setting.

Should an owner adjust the Wall Connector rotary switch?

The verified material specifically directs an electrician to perform the adjustment and states that there must be no power to the Wall Connector first.

Can the vehicle be driven with CC_a024?

Not yet established by verified evidence.

20. Sources & verification

Accepted ResearchVerified
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Tesla CC_a024: Unable to charge - Low Wall Connector current Primary… | EV Diagnostics