Kia EV charger displays E12 and refuses to start; often appears immediately after power-up.

Safety first: Internal self-test failures indicate that safety functions may not be working correctly. Do not attempt to bypass diagnostics.

• 1. Full power cycle: Turn off the charger at the breaker for 5–10 minutes, then restore power and observe if E12 reappears.
• 2. Check for firmware update: Use the Kia charger app or service interface (if available) to check for and apply any firmware updates recommended by Kia.
• 3. Inspect for loose covers or damage: Ensure the front cover is properly seated and that there is no visible physical damage that could affect internal sensors.
• 4. Internal harness check (technician): With power off and cover removed, a technician should verify that all internal connectors between the main control board, power board, CT, and sensors are fully seated and undamaged.
• 5. Replace main control board: If E12 persists after firmware and connection checks, the main control board is likely defective and should be replaced.