E13
Cadillac Load Management / Derating Fault

Charger shows E13; charging stops when another large load in the home turns on (e.g., HVAC, oven).

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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

Incorrect configuration of load management module, Faulty current transformer (CT) clamp on service conductors, Loose communication cable between load management module and charger, Firmware bug in load sharing algorithm

How to Fix / Troubleshooting

Safety first: Load management involves the main service conductors; only a licensed electrician should adjust CT clamps or service wiring.

User-level steps:

  • Review app settings: In the Cadillac or partner energy management app, verify the service size and maximum allowable EV charging current are set correctly.
  • Observe pattern: Note which household loads cause E13. This information will help a technician diagnose misconfigured load limits.
  • Power cycle: Turn the charger breaker OFF for 2 minutes, then ON, and test again.

When to call a technician: If E13 persists, an electrician or EVSE technician should verify CT orientation, wiring, and configuration of the Cadillac load management module, and replace any faulty CTs or communication harnesses.

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Repair Difficulty

Hard 4/5

Required Part

Cadillac Home Load Management Module and CT Clamp Set
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