U1012Airbag unit supply voltage too high

• Volkswagen group code · Airbag (SRS)
• Lights a warning lamp

How the car detects it

The airbag unit measured too high a supply voltage, usually from the charging system or from jump-starting. 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

• PossibleAlternator overcharging
• RareJump-starting or a charger connected with the engine running

Sources

• static.nhtsa.gov › MC-10241183-0001.pdf · official document

Backed by an official manufacturer document.

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