B0084 code meaning
Second Row Center Seat Belt Load Limiter Deployment Control
What B0084 means
B0084 names a squib-switched force limiter for the middle rear seat. Neither a carmaker nor a bulletin shows it with that meaning, and the hardware is rare: NHTSA's 2013 evaluation reports load limiters as standard only at the outer front seats, and the rear centre belt is often a plain retractor. A Delphi patent for rear seats without airbags instead chooses between roughly 4–6 kN and 2–3 kN purely mechanically, with no firing loop at all. Owners usually meet B0084 through GM. The 2011 Saab 9-4X, a Global A design, stores it for the right front impact sensor, set after ten seconds of a short, open or bad data; PI1480 covers it on the 2015 Colorado/Canyon. Saab 9-3 and 9-5 modules use it for the driver seat position sensor and then disable the driver airbag's second stage.
B0084 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0084
- Airbag warning lamp on
- On Saab 9-3/9-5 the second stage of the driver airbag is disabled
- Safety note: airbag system with pyrotechnic parts; diagnose only de-energised at a specialist workshop
Common causes of B0084
- Most likelyOn GM vehicles, fault at the right front impact sensor or its plug (different meaning)
- PossibleOn Saab 9-3/9-5, open or short in the driver seat position sensor circuit (different meaning)
- Less likelyDamaged lead to a centre rear limiter where one is fitted
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Second row center load limiterSquib circuitSRS control module
What each part of B0084 means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 84 | The exact fault in that area. |
What to do next
- Note B0084 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about B0084
What does B0084 mean?
B0084 means "Second Row Center Seat Belt Load Limiter Deployment Control". B0084 names a squib-switched force limiter for the middle rear seat. It is a generic code, so it means the same on every make.
Is it safe to drive with B0084?
B0084 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0084 fail an emissions test?
B0084 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is B0084 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will B0084 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.