E19
Cadillac Real-Time Clock / Scheduler Fault

Charger shows E19; unit may not recognize scheduled charging times or may ignore app commands.

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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 real-time clock (RTC) chip on control board, Depleted backup battery or capacitor for RTC, Firmware bug affecting scheduling, Corrupted configuration data

How to Fix / Troubleshooting

Safety first: No high-voltage work is required for basic checks, but do not open the charger while energized.

Steps to try:

  • Disable schedules: In the app or charger menu, turn off all scheduled charging and test immediate charging.
  • Reset configuration: If available, perform a factory reset following the Cadillac EV Home Charger manual, then reconfigure schedules.
  • Power cycle: Turn the breaker OFF for 2 minutes, then ON, and re-test.

When to call a technician: If E19 persists and scheduling remains unreliable, the RTC or control board may need replacement.

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Repair Difficulty

Medium 3/5

Required Part

Cadillac EVSE Main Control Board (RTC Circuit)
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