B0057Third Row Center Seat Belt Sensor
- Generic OBD-II code · Body
- How the car detects it
- In J2012, B0057 is the buckle sensor for the third row's centre seat, a position found only in eight-seat vans and SUVs. FMVSS 208 S7.5(c) will require a belt warning there from September 2028. No carmaker documents B0057 publicly with this meaning. Older GM airbag modules give the number a different job: the 2006 Saab 9-5 and the Saab 9-3 store B0057 when the passenger pretensioner loop resistance stays under 1.5 ± 0.2 ohms for 2 seconds. GM bulletin 14609 lists B0057 with B0058, B0059 and B0064 to B0066 on 2004-09 Colorado and Canyon extended cabs, whose rear door harness can suffer fatigue breaks and can disable the front pretensioners; GM extended coverage to 10 years. On older GM vehicles, check the pretensioner loop first.
- What you may notice
- Airbag warning lamp on
- Depending on the module: wrong belt status for the middle third-row seat, or passenger pretensioner possibly inactive
- Safety note: buckle and pretensioner plugs carry firing circuits nearby; only unplug them with the battery disconnected and the wait time observed
- Likely causes
- PossibleFaulty buckle sensor or lead at the middle third-row seat
- PossibleOlder GM trucks: broken wire in the rear door harness to the pretensioner (bulletin 14609)
- RareOlder GM/Saab module: shorted passenger pretensioner squib or connector
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.