B0070 code meaning
Driver Seat Belt Pretensioner A Deployment Control
What B0070 means
B0070 covers the firing loop of the driver's first (A) belt pretensioner, the squib the airbag module ignites to take slack out of the belt in a crash. A short or open in that loop lets the module no longer count on the device, so it lights the airbag lamp. Toyota names the code in exactly this sense: its Tundra bulletin T-SB-0057-22 (model year 2022) lists B007011 (short to ground) and B007012 (short to battery), there triggered by the wireless Qi charger and cured by reprogramming the SRS ECU. J2012 does not fix which device is A; GM notes that a front seat may carry a retractor, buckle or anchor pretensioner, or more than one. Mitsubishi logs its front retractor units under its own codes B1029/B102A. Saab 9-3 airbag modules use B0070 for the passenger curtain loop instead.
B0070 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 B0070
- Airbag warning lamp on
- Driver belt is not tightened in a crash; airbags themselves are usually unaffected
- Safety note: the pretensioner is a pyrotechnic part; work on it only with the battery disconnected and the wait time observed, ideally at a specialist workshop
Common causes of B0070
- Most likelyLoose or corroded plug at the driver pretensioner (B-pillar base or seat side)
- PossibleFiring lead chafed by seat rails or trim clips
- Less likelyInterference from added electronics, e.g. a wireless charger (Toyota Tundra 2022, ECU update)
- Less likelyInternal fault in the pretensioner squib
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Driver seatbelt pretensionerSquib circuitSRS control module
What each part of B0070 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). |
| 70 | The exact fault in that area. |
What to do next
- Note B0070 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 B0070
What does B0070 mean?
B0070 means "Driver Seat Belt Pretensioner A Deployment Control". B0070 covers the firing loop of the driver's first (A) belt pretensioner, the squib the airbag module ignites to take slack out of the belt in a crash. It is a generic code, so it means the same on every make.
Is it safe to drive with B0070?
B0070 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0070 fail an emissions test?
B0070 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 B0070 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 B0070 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.