E17
Cadillac Current Derating / Sensor Calibration Fault

Charger shows E17; unit may charge at reduced current only, even when set to maximum.

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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

Mis-calibrated internal current sensor, Partial failure of current transformer (CT), Firmware misconfiguration of maximum current, Loose connection on current sense wiring

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker before any physical inspection.

User-level steps:

  • Check settings: In the charger’s app or configuration interface, verify the maximum current is set to the correct value for your circuit and charger model.
  • Power cycle: Turn the breaker OFF for 2 minutes, then ON, and test again.
  • Observe charging current: Use the vehicle’s display to note the actual current draw versus the expected value; provide this to a technician.

When to call a technician: If E17 persists and current remains limited, the internal current sensor or its wiring may need recalibration or replacement by an EVSE technician.

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Repair Difficulty

Hard 4/5

Required Part

Cadillac EVSE Internal Current Sensor (CT) and Sense Harness
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