B0046Left Curtain Deployment Loop Open
- Generic OBD-II code · Body
- How the car detects it
- B0046 appears in none of the accessible J2012 code lists, which jump from B0043 to B0048, and no carmaker or bulletin uses it publicly, so the code cannot be traced to a vehicle. Its title describes an open firing loop of the left curtain airbag that drops from the roof rail. J2012 normally encodes that fault as B0021 with failure type 13: Mitsubishi stores B0021-13 when the left curtain circuit has been open for 2 seconds, and Mercedes-Benz reads B002113 as an open left windowbag squib. GM's Global A modules report the same fault as B0016 04 for the left roof rail airbag. If B0046 is read, trust the text the scan tool shows. Airbag lamp on.
- What you may notice
- Airbag warning lamp on
- Left curtain airbag may not deploy in a side impact or rollover
- Safety note: do not probe the airbag circuit yourself; unplug airbag connectors only with the battery disconnected and the stated wait time observed
- Likely causes
- LikelyUnplugged or loose curtain airbag connector at the pillar or roof rail
- PossibleBroken lead in the roof rail harness, e.g. after headliner work
- RareOpen igniter inside the left curtain airbag
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.