U1111Battery sensor fault

• Hyundai/Kia code · Engine

How the car detects it

The engine computer found a fault in the battery sensor on the negative battery terminal, which it uses to control the alternator. An extra ground cable bolted to the negative terminal (for accessories) is a known cause: Kia asks not to add one. Only on cars with a battery sensor.

What you may notice

• Alternator charges wrongly
• Stop-start (ISG) misbehaves

Likely causes

• LikelyExtra ground cable on the negative battery terminal
• PossibleBattery sensor or its connector
• RareWiring

Sources

• vehicleservicepros.com › kia-no-more-grounds-please-2011-12-28 · official document
• go-parts.com › obd-u1111

Backed by an official manufacturer document.

From Obdaryn's Hyundai/Kia pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.