E13
General Motors Self‑Test Failure / Internal Diagnostics Error

Charger shows E13; LED indicators may flash in a repeating pattern and charging is disabled.

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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.

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Possible Causes

Failed internal self‑test on power‑up, Faulty current sensor on output, Defective internal voltage sensing circuit, Damaged internal wiring harness between boards

How to Fix / Troubleshooting

Safety first: Ensure the vehicle is unplugged before cycling power.

Steps:

  • Power cycle: Turn OFF the breaker for 5 minutes, then turn it back ON and observe the startup sequence.
  • Check for patterns: Note any LED blink codes and reference the GM charger manual; some models provide more detail via LEDs.
  • Eliminate external causes: Confirm that supply voltage and ground are correct (have an electrician verify if in doubt).

If E13 recurs on every startup with correct supply conditions, an internal sensor or diagnostic circuit has failed. The charger should be replaced or serviced by a GM‑authorized technician; there is no safe homeowner repair for this condition.

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Repair Difficulty

Professional Required 5/5

Required Part

GM Internal Current/Voltage Sensor Assembly
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