E05
Cadillac Input Voltage Out of Range

Charger shows E05 and refuses to start; may occur after a brownout or power surge.

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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 supply voltage (e.g., 120 V wired to 240 V charger), Loose line or neutral connection at breaker or charger terminal block, Utility undervoltage or overvoltage condition, Damaged input voltage sensing circuit on control board

How to Fix / Troubleshooting

Safety first: Turn OFF the breaker before removing any covers. Only a qualified person should measure live voltage.

User-level checks:

  • Confirm breaker rating: Verify the charger is on the correct double‑pole breaker size specified in the Cadillac EV Home Charger installation manual (commonly 40–60 A at 240 V).
  • Check for recent electrical work: If any panel or wiring changes were made recently, contact the electrician to confirm the charger circuit is wired correctly (line-to-line 240 V, proper ground, no shared neutral unless specified).
  • Power cycle: After any utility event (outage, flicker), turn the breaker OFF for 2 minutes, then ON and test again.

When to call a technician: If E05 persists, an electrician should measure the line voltage at the charger input and verify terminations. If voltage is correct, the internal sensing circuit or control board may be defective and require replacement by an EVSE technician.

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Repair Difficulty

Hard 4/5

Required Part

Cadillac EVSE Control Board (Input Voltage Sense Circuit)
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