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Tesla MCU_u019

Active service connection to vehicle Service performing remote diagnostics

Common search variants: MCUu019 · MCU-u019 · MCU u019 · Search ignores case and common separators.

DriveYes. Verified Tesla owner-manual evidence states that the vehicle is OK to drive while this alert is active.
ChargeNot yet established by verified evidence.
ServiceNot yet established by verified evidence for this alert alone. The verified owner-manual evidence describes an active Tesla Service remote diagnostic or repair session.
Confidence95%

Quick answer

MCU_u019 means a Tesla service technician is remotely logged into the vehicle for diagnosis or repair. The verified owner-manual evidence states that this alert does not indicate a vehicle issue.

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 MCU_u019 mean?

MCU_u019 means a Tesla service technician is remotely logged into the vehicle for diagnosis or repair. The verified owner-manual evidence states that this alert does not indicate a vehicle issue.

2. Technical explanation

Tesla identifies MCU_u019 as “Active service connection to vehicle Service performing remote diagnostics.” Verified NHTSA-hosted Tesla owner-manual communications state that a service technician is remotely logged into the vehicle for diagnosis or repair. The connection may temporarily affect some Infotainment functions while it remains active.

3. What system is affected?

Remote Tesla Service diagnostic connection and Infotainment functionality.

4. How serious is this code?

The diagnostic record lists severity as unknown. However, verified Tesla owner-manual evidence states that the alert itself does not indicate an issue with the vehicle.

5. Symptoms you may notice

  • The MCU_u019 alert is displayed.
  • Some loss of Infotainment functionality may be noticed while the remote service connection persists.

6. Possible causes

  • A Tesla service technician is remotely logged into the vehicle for diagnosis or repair.

7. Can I still drive the vehicle?

Yes. Verified Tesla owner-manual evidence states that the vehicle is OK to drive while this alert is active.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Be aware that some Infotainment functions may be unavailable while the remote service connection persists.
  • If you were expecting Tesla remote diagnosis or repair, allow the service connection to continue.

10. Step-by-step troubleshooting

  1. No owner-performed troubleshooting procedure is established by the supplied verified evidence.
  2. The alert is associated with an active remote connection by a Tesla service technician.

11. When to contact service

Not yet established by verified evidence for this alert alone. The verified owner-manual evidence describes an active Tesla Service remote diagnostic or repair session.

12. What the service center may check

  • Tesla Service may remotely diagnose or repair the vehicle through the active service connection.

13. Possible repair or resolution

  • The supplied verified evidence does not establish a component repair or replacement for MCU_u019.
  • The alert corresponds to a Tesla Service technician being remotely logged into the vehicle.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication PDF 10250482: Tesla owner-manual material describing MCU_u019. Published 2023-12-01. https://static.nhtsa.gov/odi/tsbs/2023/MC-10250482-9999.pdf
  • NHTSA Manufacturer Communication PDF 10250483: Tesla owner-manual material describing MCU_u019. Published 2023-12-01. https://static.nhtsa.gov/odi/tsbs/2023/MC-10250483-9999.pdf
  • NHTSA Manufacturer Communication PDF 10253658: Tesla owner-manual material describing MCU_u019. Published 2024-03-26. https://static.nhtsa.gov/odi/tsbs/2024/MC-10253658-9999.pdf
  • NHTSA Manufacturer Communication PDF 10253660: Tesla owner-manual material describing MCU_u019. Published 2024-03-26. https://static.nhtsa.gov/odi/tsbs/2024/MC-10253660-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified official evidence consists of NHTSA-hosted Tesla manufacturer communications/owner-manual material. It identifies MCU_u019 as an active Tesla Service remote diagnostic connection and states that the alert does not indicate a vehicle issue. Verified applicability is Tesla vehicles in the US: Model 3 (2017–2023); Model S (2012–2023); and Model X (2016–2023).

19. Frequently asked questions

What does Tesla MCU_u019 mean?

It means a Tesla service technician is remotely logged into the vehicle for diagnosis or repair.

Does MCU_u019 mean the vehicle has a fault?

No. Verified Tesla owner-manual evidence states that this alert does not indicate an issue with the vehicle.

Can I drive with MCU_u019 active?

Yes. Verified Tesla owner-manual evidence states that the vehicle is OK to drive.

Why is my screen or Infotainment behaving differently?

Tesla states that some loss of Infotainment functionality may occur while the remote service connection persists.

Can I charge with MCU_u019 active?

Not yet established by verified evidence.

20. Sources & verification

Verified
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Tesla MCU_u019: Active service connection to vehicle Service… | EV Diagnostics