Audi EV charger shows E18 and the app indicates ‘Internal clock error’ or scheduled charging does not work.

Safety first: This is a low-voltage electronics issue; no high-voltage work is required for basic troubleshooting.

• Reset time settings: Using the Audi app or web interface, manually set the correct date and time, then save. Check if E18 clears.
• Disable schedules temporarily: Turn off scheduled charging and tariff-based features to see if normal immediate charging works without errors.
• Firmware update: Install any available firmware updates that may address RTC issues.
• Board-level repair: If E18 persists and time drifts rapidly or resets on every power cycle, the RTC hardware or backup battery on the main board is likely defective. Replace the main control board.

Until repaired, avoid relying on scheduled charging; use manual start/stop instead.