B1101Airbag unit supply voltage too high

• Hyundai/Kia code · Airbag (SRS)
• Lights a warning lamp

How the car detects it

The airbag control unit measured more than about 16 V. While an airbag fault is stored, the affected airbag or pretensioner may not deploy in a crash. Have it repaired before relying on it. Never probe airbag connectors with a meter: that can fire the airbag.

What you may notice

• Airbag warning light

Likely causes

• LikelyCharging-system overvoltage

Sources

• static.nhtsa.gov › INRD-EA19001-76579.pdf · official document
• youcanic.com › hyundai-fault-code-dtc

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.