B0072Passenger Seat Belt Pretensioner A Deployment Control
- Generic OBD-II code · Body
- How the car detects it
- B0072 reports a fault in the deployment loop of the front passenger's A-stage belt pretensioner. While that loop is faulty the device cannot be relied on to fire, so the airbag module lights its lamp and keeps the code. Toyota uses the number this way: T-SB-0057-22 for the 2022 Tundra and Tundra Hybrid lists B007212, a short to battery, among the codes the wireless charger can provoke, and the remedy is an SRS ECU reprogramming. The passenger seat often carries further devices; Mercedes logs the passenger's belt end fitting tensioner and retractor as B007A and B007F, and FCA ties B007F to the passenger retractor at the B-pillar. NHTSA's 2013 evaluation explains how buckle and retractor pretensioners remove slack. Whatever the hardware, a stored B0072 means passenger pretensioning is not assured.
- What you may notice
- Airbag warning lamp on
- Front passenger belt may stay slack in a crash
- Safety note: the pretensioner is pyrotechnic; only handle it de-energised (battery off, wait time) and have it serviced at a specialist workshop
- Likely causes
- LikelyPassenger pretensioner plug not latched or corroded
- PossibleLead pinched at the passenger seat base or B-pillar trim
- RareInterference from added electronics such as a wireless charger
- RarePretensioner squib with internal fault
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.