B0074 code meaning
Second Row Center Seat Belt Pretensioner Deployment Control
What B0074 means
B0074 would flag the firing loop of a pretensioner at the second row's middle seat. Rear centre belts with their own pretensioner are rare; IIHS rear-seat tests concentrate on the outboard positions, and no carmaker publishes B0074 with the J2012 meaning. The code is common in GM vehicles, but with an older meaning: the 2011 Saab 9-4X sets B0074 00/04 when the passenger presence module loses its seat sensor mat, GM's Impala bulletin PIE0485A (2015–2018) covers B0074-0D, and campaign N182188910 for the 2017 Buick Verano ties B0074 0D/0E to a pinched presence sensor wire that suppresses the passenger airbag. In a GM vehicle, B0074 therefore points to the front passenger seat sensing, not a rear belt. Where the code does mean a rear centre pretensioner, the airbag lamp is on and that unit is inactive.
B0074 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B0074
- Airbag warning lamp on
- On GM vehicles also passenger airbag status shows OFF with an adult seated
- Safety note: restraint parts may be pyrotechnic or part of the airbag control; disconnect the battery, observe the wait time and use a specialist workshop
Common causes of B0074
- Most likelyOn GM vehicles, fault in the passenger presence sensor mat or its pinched wire (older GM meaning)
- PossiblePlug of the rear centre pretensioner disturbed when the bench is folded or removed
- Less likelyOpen or short in the harness to the rear centre seat
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Second row center pretensionerSquib circuitSRS control module
What each part of B0074 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). |
| 74 | The exact fault in that area. |
What to do next
- Note B0074 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 B0074
What does B0074 mean?
B0074 means "Second Row Center Seat Belt Pretensioner Deployment Control". B0074 would flag the firing loop of a pretensioner at the second row's middle seat. It is a generic code, so it means the same on every make.
Is it safe to drive with B0074?
B0074 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0074 fail an emissions test?
B0074 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 B0074 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will B0074 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.