Body, generic

B0076 Third Row Left Seat Belt Pretensioner Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0076 belongs to the pretensioner at the left seat of the third row, a position found only in vehicles with a third seat row. No carmaker publishes B0076 with this meaning. Mercedes shows how third-row units are logged in practice: its LI54.21-P-070658 names open-circuit faults of the emergency tensioning retractors at the left and right of the third seat row as B00E7 and B00E6, the C-stage slots, so a B0076 is not to be expected on those models. The circuit itself is a pyrotechnic squib that the airbag module checks for opens, shorts and resistance drift, as with the front retractor and buckle units GM and NHTSA describe. If B0076 is stored, the airbag lamp is on and the third-row left occupant may not get any pretensioning.

Likely causes

Plug at the third-row left belt disturbed by folding or removing the seat
Harness damaged by luggage or trim work in the cargo area
Airbag module coded for a third-row pretensioner that is not fitted

Symptoms

  • Airbag warning lamp on
  • Third-row left occupant without pretensioning in a crash
  • Safety note: pyrotechnic belt component; disconnect the battery and wait before touching it, repair at a specialist workshop

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–600
Time0.5–3 h

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

Parts involved

third row left pretensionersquib circuitsrs control module

Related codes

B0077B0078B00E7

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