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Tesla CHG_w037

Unable to charge - Wall connection too hot Outlet or Wall Connector wiring must be checked

Common search variants: CHGw037 · CHG-w037 · CHG w037 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeCharging is slowed according to verified Tesla documentation. Whether charging can continue or should be attempted is not otherwise established by verified evidence.
ServiceContact an electrician to inspect the building wiring connection to the Wall Connector. Tesla documentation states this condition is not typically an issue with the vehicle.
Confidence95%

Quick answer

CHG_w037 means the Wall Connector detected high temperature at its building connection. Charging has been slowed to protect the wiring and Wall Connector; the outlet or Wall Connector wiring must be checked.

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 CHG_w037 mean?

CHG_w037 means the Wall Connector detected high temperature at its building connection. Charging has been slowed to protect the wiring and Wall Connector; the outlet or Wall Connector wiring must be checked.

2. Technical explanation

Tesla owner-manual material filed with NHTSA states that this alert is triggered when the building connection to the Wall Connector is getting too warm. The alert message is: “Unable to charge - Wall connection too hot Outlet or Wall Connector wiring must be checked.” Tesla states that charging is slowed to protect the wiring and Wall Connector.

3. What system is affected?

The building-side electrical connection to the Tesla Wall Connector, including the outlet or Wall Connector wiring connection. Verified evidence does not establish a vehicle high-voltage battery fault.

4. How serious is this code?

The database severity is unknown. Verified documentation establishes an overheating condition at the Wall Connector’s building connection and directs that it be inspected.

5. Symptoms you may notice

  • CHG_w037 alert is displayed.
  • The alert reports that the wall connection is too hot.
  • Charging is slowed to protect the wiring and Wall Connector.

6. Possible causes

  • High temperature detected at the Wall Connector’s building connection.
  • The documentation directs an electrician to inspect whether wiring is properly connected and torqued according to the Wall Connector installation guide. A specific underlying installation defect is not established by the supplied evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Charging is slowed according to verified Tesla documentation. Whether charging can continue or should be attempted is not otherwise established by verified evidence.

9. What you can safely do

  • Contact an electrician to inspect the building wiring connection to the Wall Connector.
  • Have the electrician verify that wires are properly connected and torqued according to the applicable Wall Connector installation guide.
  • Do not perform electrical wiring or Wall Connector internal work yourself.

10. Step-by-step troubleshooting

  1. Use a qualified electrician for inspection of the building connection to the Wall Connector.
  2. The supplied evidence does not establish additional owner-performed troubleshooting steps.

11. When to contact service

Contact an electrician to inspect the building wiring connection to the Wall Connector. Tesla documentation states this condition is not typically an issue with the vehicle.

12. What the service center may check

  • Inspect the building wiring connection to the Wall Connector.
  • Verify that all wires are properly connected.
  • Verify that wiring is torqued according to the Wall Connector installation guide.

13. Possible repair or resolution

  • Resolution is not specifically established by the supplied evidence. Tesla documentation indicates the building connection should be inspected and corrected as necessary by an electrician.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA manufacturer communications containing Tesla owner-manual guidance for CHG_w037 include MC-10253660 (published 2024-03-26), MC-10250483 (published 2023-12-01), and MC-10240951 (published 2023-06-09).
  • Official source: 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 applicability: US Tesla Model 3 (2017–2023); Model S (2012–2023); and Model X (2016–2023). Source material is Tesla documentation filed with NHTSA. Official example: https://static.nhtsa.gov/odi/tsbs/2023/MC-10250483-9999.pdf

19. Frequently asked questions

What does CHG_w037 mean?

It means high temperature was detected at the Wall Connector’s building connection, and the outlet or Wall Connector wiring must be checked.

Is the vehicle itself identified as the problem?

Tesla documentation states this is not typically an issue with the vehicle; it directs inspection of the building wiring connection to the Wall Connector.

Who should inspect the wiring?

Tesla directs the owner to contact an electrician.

What should the electrician check?

Tesla states that the wiring should be properly connected and torqued according to the Wall Connector installation guide.

20. Sources & verification

Verified
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