Charger shows E15; charging may be limited or disabled when used with certain GM vehicles.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Outdated charger firmware not recognizing newer GM EV models, Incorrect region configuration on charger, Faulty vehicle identification logic on control board

How to Fix / Troubleshooting

Steps:

Update firmware: Use the GM charging app or follow GM’s instructions to update the charger firmware to the latest version.
Check region settings: Ensure the charger is configured for your country/region as specified in the GM manual.
Test with another GM EV: If an older GM EV charges normally but a newer one does not, firmware compatibility is likely the issue.

If E15 persists after firmware update and correct configuration, the identification logic on the main board may be defective. Contact GM support for further diagnostics or replacement.

Repair Difficulty

Medium 3/5

Required Part

GM Main Control Board (Firmware/Logic Section)

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