B0058 code meaning
Third Row Right Seat Belt Sensor
What B0058 means
B0058 is the J2012 code for the buckle sensor at the right seat of the third row. The sensor reports a latched or free belt to the module that runs the rear belt display, which FMVSS 208 S7.5(c) makes mandatory for every rear seat from September 2028. Fold-flat third rows and access from the right-hand sliding door put the lead under strain. No carmaker documents B0058 publicly with this meaning. Older GM modules again differ: on the 2006 Saab 9-5 B0058 means an open passenger pretensioner loop, with more than 4.5 ± 0.2 ohms for 2 seconds, while the Saab 9-3 also knows a high-resistance variant. GM bulletin 14609 for 2004-09 Colorado and Canyon extended cabs covers B0058 among the pretensioner codes caused by broken rear door wires.
B0058 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 B0058
- Airbag warning lamp on
- Depending on the module: right third-row seat shown wrongly, or passenger pretensioner may not fire
- Safety note: buckle and pretensioner plugs carry firing circuits nearby; only unplug them with the battery disconnected and the wait time observed
Common causes of B0058
- PossibleBuckle lead of the right third-row seat damaged by folding or loading
- PossibleOlder GM/Saab module: open passenger pretensioner loop, e.g. broken rear door wire
- Less likelyFaulty sensor in the right third-row buckle
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Seat belt buckle switchSRS seat wiringPassenger seatbelt pretensionerSRS control module
What each part of B0058 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). |
| 58 | The exact fault in that area. |
What to do next
- Note B0058 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 B0058
What does B0058 mean?
B0058 means "Third Row Right Seat Belt Sensor". B0058 is the J2012 code for the buckle sensor at the right seat of the third row. It is a generic code, so it means the same on every make.
Is it safe to drive with B0058?
B0058 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B0058 fail an emissions test?
B0058 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 B0058 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will B0058 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.