U1112Battery sensor communication fault

• Hyundai/Kia code · Engine

How the car detects it

The engine computer can't talk to the battery sensor over its single-wire (LIN) link. 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
• obdadvisor.com › hyundai-u1112

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.