EV Diagnostics
Verified EV diagnostic knowledge page

Tesla CP_a066

Charging equipment not ready See equipment instructions to start charging

Common search variants: CPa066 · CP-a066 · CP a066 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNo. Verified Tesla documentation states that charging cannot begin while this alert condition is present.
ServiceNot yet established by verified evidence. The verified documentation directs the owner to review charging-equipment instructions and other charging alerts.
Confidence95%

Quick answer

Tesla alert CP_a066 means charging cannot begin because the charging station is reporting that external charging equipment is not ready or that charging is not authorized.

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.

#Tesla #CP_a066_proxLatchedIdlePilot Charging equipment not ready See equipment instruction to startDigital EV Doctor (Tesla alert clear)

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

1. What does CP_a066 mean?

Tesla alert CP_a066 means charging cannot begin because the charging station is reporting that external charging equipment is not ready or that charging is not authorized.

2. Technical explanation

Tesla documentation submitted to NHTSA states that the charging station communicates this condition to the vehicle through the control-pilot signal between the station and vehicle. The alert identifies a charging-equipment readiness or authorization condition; it does not, by itself, establish a specific failed vehicle component.

3. What system is affected?

External charging equipment and the charging-station-to-vehicle control-pilot communication.

4. How serious is this code?

Not yet established by verified evidence. The verified documentation establishes that charging cannot begin.

5. Symptoms you may notice

  • The vehicle displays CP_a066: “Charging equipment not ready See equipment instructions to start charging.”
  • Charging cannot begin.

6. Possible causes

  • The charging station is communicating that the external charging equipment is not ready.
  • The charging station is communicating that charging is not authorized.
  • A more specific accompanying charging-related alert may identify the particular condition.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

No. Verified Tesla documentation states that charging cannot begin while this alert condition is present.

9. What you can safely do

  • Follow the charging equipment instructions.
  • Check the vehicle touchscreen for other recent charging-related alerts.
  • On applicable documentation, Tesla directs users to Controls > Service > Notifications to review other recent charging alerts.

10. Step-by-step troubleshooting

  1. Review the charging equipment instructions.
  2. Review other recent charging-related alerts in the vehicle touchscreen. Tesla documentation states that CP_a066 is accompanied by at least one other alert identifying a more specific condition.

11. When to contact service

Not yet established by verified evidence. The verified documentation directs the owner to review charging-equipment instructions and other charging alerts.

12. What the service center may check

  • Review the additional charging-related alert(s) that Tesla documentation says are present with CP_a066; those alerts identify the more specific condition.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA manufacturer communications containing Tesla owner-manual information document CP_a066, including NHTSA communication 10250484 (published December 1, 2023): https://static.nhtsa.gov/odi/tsbs/2023/MC-10250484-9999.pdf
  • These communications document the alert meaning and owner guidance; no vehicle-specific repair procedure is established by the supplied evidence.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official Tesla owner-manual content was submitted to NHTSA in manufacturer communications. It states that CP_a066 occurs when the charging station reports that equipment is not ready or charging is not authorized, and directs the owner to equipment instructions and other charging alerts. Example: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250485-9999.pdf

19. Frequently asked questions

What does Tesla CP_a066 mean?

It means charging cannot begin because the charging station is communicating that external charging equipment is not ready or charging is not authorized.

Will another alert provide more detail?

Yes. Tesla documentation states there will always be at least one other alert identifying a more specific condition.

What should I check first?

Follow the charging equipment instructions and check the touchscreen for other recent alerts involving charging.

Can I drive with CP_a066?

Not yet established by verified evidence.

20. Sources & verification

Accepted ResearchVerified
Show all 58 verified sources
Tesla CP_a066: Charging equipment not ready See equipment instructions… | EV Diagnostics