EV Diagnostics
Verified EV diagnostic knowledge page

Tesla CP_a055

Charging equipment communication lost Check power source and charging equipment

Common search variants: CPa055 · CP-a055 · CP a055 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeCharging was stopped when this alert occurred. Whether charging can resume is not yet established by verified evidence.
ServiceWhether Tesla service is required is not yet established by verified evidence. Tesla documentation says this alert does not typically indicate an issue with the vehicle.
Confidence95%

Quick answer

Tesla alert CP_a055 means charging stopped because communication between the vehicle and external charging equipment was interrupted. Tesla documentation says this is usually specific to the external charging equipment or power source and does not typically indicate a vehicle issue.

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 CP_a055 mean?

Tesla alert CP_a055 means charging stopped because communication between the vehicle and external charging equipment was interrupted. Tesla documentation says this is usually specific to the external charging equipment or power source and does not typically indicate a vehicle issue.

2. Technical explanation

CP_a055 is an OEM Tesla charging alert: “Charging equipment communication lost — Check power source and charging equipment.” Verified Tesla owner-manual material filed with NHTSA states that charging stopped because communication between the vehicle and external charging equipment was interrupted.

3. What system is affected?

External charging equipment and power source communication.

4. How serious is this code?

Severity is not yet established by verified evidence.

5. Symptoms you may notice

  • Charging stopped.
  • A CP_a055 alert is displayed: “Charging equipment communication lost — Check power source and charging equipment.”

6. Possible causes

  • Interrupted communication between the vehicle and external charging equipment.
  • Tesla documentation states the alert is usually specific to external charging equipment and power sources.
  • A specific underlying equipment or power-source fault is not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Charging was stopped when this alert occurred. Whether charging can resume is not yet established by verified evidence.

9. What you can safely do

  • Check the power source and charging equipment, as directed by the alert.
  • Refer to the applicable charging-equipment owner’s manual for Mobile Connector or Wall Connector status-light troubleshooting.
  • Refer to Tesla Charging Instructions and Charging & Adapter Product Guides.

10. Step-by-step troubleshooting

  1. Use the applicable charging-equipment owner’s manual to interpret Mobile Connector or Wall Connector status lights.
  2. Review Tesla Charging Instructions for the vehicle.
  3. No further step-by-step troubleshooting procedure is established by the supplied verified evidence.

11. When to contact service

Whether Tesla service is required is not yet established by verified evidence. Tesla documentation says this alert does not typically indicate an issue with the vehicle.

12. What the service center may check

  • Determine whether communication between the vehicle and external charging equipment was interrupted.
  • Assess the external charging equipment and power source. Specific service tests are not established by verified evidence.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication PDF 10250484, published December 1, 2023: Tesla owner-manual material describing CP_a055. https://static.nhtsa.gov/odi/tsbs/2023/MC-10250484-9999.pdf
  • NHTSA Manufacturer Communication PDF 10253666, published March 27, 2024: Tesla owner-manual material including CP_a055. https://static.nhtsa.gov/odi/tsbs/2024/MC-10253666-9999.pdf

16. Recall information

  • No recall information was supplied in the verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Tesla documentation describes CP_a055 as an interruption of communication with external charging equipment and directs users to Charging Instructions and Charging & Adapter Product Guides. https://static.nhtsa.gov/odi/tsbs/2023/MC-10250484-9999.pdf

19. Frequently asked questions

What does Tesla CP_a055 mean?

It means charging stopped because communication between the vehicle and external charging equipment was interrupted.

Does CP_a055 usually indicate a vehicle problem?

Tesla documentation says the alert is usually specific to external charging equipment and power sources and does not typically indicate an issue with the vehicle.

What does the alert tell me to check?

Check the power source and charging equipment.

Can I still drive or charge?

Driving status and whether charging can resume are not yet established by verified evidence. The verified documentation establishes that charging stopped when the alert occurred.

20. Sources & verification

Accepted ResearchVerified
Show all 58 verified sources
Tesla CP_a055: Charging equipment communication lost Check power… | EV Diagnostics