B0046
Left Curtain Deployment Loop Open
An open circuit has been detected in the deployment loop of the left curtain (head) airbag. Curtain protection on the driver side will not deploy.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Common causes
Ordered by how often each turns out to be the cause.
- Broken wire in headlinerCommon
- Curtain airbag connector unseatedPossible
Parts involved
- Left Curtain Airbag
- Srs Roof Wiring
B0046 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.