B001A code meaning
Center Frontal Stage 3 Deployment Control
What B001A means
B001A closes the first-row center frontal series and stands for a third stage of a middle-seat frontal airbag, matching B0003 for the driver and B0012 for the passenger. No carmaker documents it publicly in this sense. At General Motors the number belongs to the anchor-mounted belt pretensioner on the driver side, a second pretensioner at the belt end fitting that works next to the retractor unit coded B0015. Its limits match the other GM squib loops: a pretensioner loop reading beyond 4.2 ohms or beneath 1.4 ohms for two seconds sets the code, as do shorts and opens. GM bulletins report it on the 2009-11 Impala with a pinched or misrouted pretensioner harness (PIC5396A, 15-NA-074) and on Equinox and Traverse 2018 (PIE0438). On GM vehicles look at the lower belt anchor first. The airbag lamp is on.
B001A 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 B001A
- Airbag warning lamp on
- On GM the driver anchor pretensioner may not fire
- 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 B001A
- Most likelyOn GM vehicles pinched, misrouted or corroded anchor pretensioner harness
- Less likelyFault in the third stage loop of a first-row center frontal airbag (J2012 meaning)
- Less likelyInternal fault in the pretensioner
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Center frontal airbagDriver seatbelt pretensionerSquib circuitSRS control module
What each part of B001A 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). |
| 1A | The exact fault in that area. |
What to do next
- Note B001A 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 B001A
What does B001A mean?
B001A means "Center Frontal Stage 3 Deployment Control". B001A closes the first-row center frontal series and stands for a third stage of a middle-seat frontal airbag, matching B0003 for the driver and B0012 for the passenger. It is a generic code, so it means the same on every make.
Is it safe to drive with B001A?
B001A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B001A fail an emissions test?
B001A 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 B001A 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 B001A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.