B002A code meaning
Right Curtain Deployment Control 2
What B002A means
B002A is the second firing loop of the right curtain airbag, needed only where the right side has two curtain inflators or a separate curtain section for the rear seats. Mercedes-Benz uses it that way on the A-Class, CLA and GLB: B002A13 marks an open squib in the right rear window bag, while the front part reports B0029; a known trigger was poor contact at the control unit plug (LI54.21-P-070658). A TRW and Ford patent describes front-row and rear-row curtains that inflate separately and may be tethered together at the B-pillar. Where curtains also deploy in a rollover, FMVSS 226 requires a readiness indicator the driver can see. Airbag lamp on; head protection for the right rear seat may be missing.
B002A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B002A
- Airbag warning lamp on
- Head protection for the right rear seat may be missing
- Safety note: do not probe the airbag circuit yourself; unplug airbag connectors only with the battery disconnected and the stated wait time observed
Common causes of B002A
- Most likelyRaised contact resistance at the restraint module connector (Mercedes LI54.21-P-070658)
- PossibleDamaged lead to the rear curtain section at the C-pillar or roof rail
- Less likelyInternal fault in the rear right curtain airbag module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Right curtain airbagSquib circuitSRS roof wiring
What each part of B002A 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). |
| 2A | The exact fault in that area. |
What to do next
- Note B002A 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 B002A
What does B002A mean?
B002A means "Right Curtain Deployment Control 2". B002A is the second firing loop of the right curtain airbag, needed only where the right side has two curtain inflators or a separate curtain section for the rear seats. It is a generic code, so it means the same on every make.
Is it safe to drive with B002A?
B002A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B002A fail an emissions test?
B002A 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 B002A to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will B002A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.