B0022 code meaning
Left Curtain Deployment Control 2
What B0022 means
B0022 belongs to a second firing loop for the left curtain airbag. Mercedes-Benz shows what that means in practice: on the A-Class, CLA and GLB, B002213 is an open squib in the left rear window bag, the curtain section for the rear seats, while B0021 serves the front one (LI54.21-P-070658, version 1 of 2019 and version 4 of 2020). Cars with a single curtain inflator never set it. General Motors has older meanings for the number: the 2006 Saab 9-5 used it for driver frontal stage 1 resistance below 2.0 ohms, and Global A modules for the passenger belt retractor pretensioner, as on the 2009-11 Impala (PIC5396A) or the Saab 9-4X. The module and descriptor shown by the scan tool decide which part is meant. Airbag lamp on.
B0022 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 B0022
- Airbag warning lamp on
- Head protection for the left 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 B0022
- 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 left curtain airbag module
- Less likelyFault or unsuitable software in the restraint control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Left curtain airbagSRS roof wiringSRS control module
What each part of B0022 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). |
| 22 | The exact fault in that area. |
What to do next
- Note B0022 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 B0022
What does B0022 mean?
B0022 means "Left Curtain Deployment Control 2". B0022 belongs to a second firing loop for the left curtain airbag. It is a generic code, so it means the same on every make.
Is it safe to drive with B0022?
B0022 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0022 fail an emissions test?
B0022 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 B0022 to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will B0022 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.