B0040Third Row Left Side Airbag Deployment Control
- Generic OBD-II code · Body
- How the car detects it
- B0040 is reserved for a side airbag at the left seat of a third row, as found in some seven-seat SUVs and vans; most of them protect that row only with an extended curtain. A Joyson (TK Holdings) patent states its seatback side module may serve any row, third included, and a GM application gives rear-row side bags their own gas generators and allows the rear row to be the third. No maker documents B0040 with this meaning. Earlier GM modules assign it elsewhere: Saab manuals for the 9-5 of 2006 and the 9-3 treat B0040 as low resistance in the driver side airbag loop, under 1.5 ohms with 0.2 tolerance for 2 seconds; bulletin 08-09-41-002H also names it for loose CPA retainers. Airbag lamp on.
- What you may notice
- Airbag warning lamp on
- Left third-row occupant may lack side airbag protection
- 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
- LikelyPoor contact at the side airbag connector of the third-row seat or rear quarter trim
- PossibleLead strained by folding or removing the third-row seat
- RareInternal fault in the third-row side airbag
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.