E14
General Motors Vehicle Communication Timeout

GM charger displays E14 and may intermittently start and stop charging.

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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

Intermittent pilot signal connection, Loose low‑voltage harness inside charger, Oxidized contacts in J1772 connector, Faulty control board communication driver

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker before handling the connector.

Steps:

  • Inspect and clean connector: Check the J1772 pins for oxidation or light corrosion. Clean gently with a dry, lint‑free cloth.
  • Secure cable routing: Ensure the GM charger cable is not under tension or twisted at the strain relief; excessive movement can stress internal conductors.
  • Test cable position: While charging (if it starts), gently move the cable near the charger housing. If charging drops out, the internal harness or strain relief may be failing.

Persistent E14 indicates an unstable communication path between the charger and vehicle. Replacement of the cable assembly or internal harness by a qualified technician is typically required.

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Repair Difficulty

Hard 4/5

Required Part

GM Low‑Voltage Harness / J1772 Cable Assembly
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