Body, generic

B0072 Passenger Seat Belt Pretensioner A Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Passenger pretensioner plug not latched or corroded
Lead pinched at the passenger seat base or B-pillar trim
Interference from added electronics such as a wireless charger
Pretensioner squib with internal fault

Symptoms

  • 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

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–700
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

passenger seatbelt pretensionersquib circuitsrs control module

Related codes

B007AB007FB0070B0052

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, crashstats.nhtsa.dot.gov.