B0012 code meaning
Passenger Frontal Stage 3 Deployment Control
What B0012 means
In the J2012 order B0012 is the third element of the front passenger airbag. Mercedes-Benz uses B001213 for the squib of the vent valve in that airbag, and Mitsubishi lists B0012 as passenger airbag module 3. GM gives the number a different meaning. Its later sensing and diagnostic modules assign B0012 to stage 1 of the steering wheel airbag; the Saab 9-4X 2011 manual trips it after two seconds of contact with supply or ground, an open, more than 4.4 ohms or less than 1.7 ohms; GM bulletins link it to chafed coil wires on the 2009 Cobalt and to weak terminal tension at the coil connector on the 2015 CTS. Older Saab 9-3 modules used B0012 for low resistance in the passenger stage 2 loop. Read the code with the maker's tool before choosing which airbag to check.
B0012 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0012
- Airbag warning lamp on
- Depending on maker, passenger airbag venting or GM driver airbag stage 1 affected
- 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 B0012
- Most likelyOn GM vehicles weak terminal tension or chafed wires at the steering wheel airbag coil
- PossibleOpen or shorted third squib (vent valve) in the passenger airbag (J2012 meaning)
- Less likelyRestraint control module fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Passenger airbag moduleDriver airbag moduleClock springSRS wiringSRS control module
What each part of B0012 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). |
| 12 | The exact fault in that area. |
What to do next
- Note B0012 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 B0012
What does B0012 mean?
B0012 means "Passenger Frontal Stage 3 Deployment Control". In the J2012 order B0012 is the third element of the front passenger airbag. It is a generic code, so it means the same on every make.
Is it safe to drive with B0012?
B0012 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0012 fail an emissions test?
B0012 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 B0012 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will B0012 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.