Body, generic

B0020 Left Side Airbag Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0020 covers the firing loop of the left front side airbag, the thorax bag usually built into the outer flank of the driver seat backrest. Toyota names B002011 and B002012 as short to ground and short to battery on the 2022 Tundra, where the wireless phone charger caused false entries that new SRS software cures (TSB005722). FCA reads B0020-13 as an open left seat squib on the 2014-17 Cherokee and the 2015-17 Chrysler 200 and fits new jumper harnesses in the seats (10-001-20). Honda collected parts from Accord, CR-V and TLX with the same byte 13, and Mitsubishi confirms each fault after 2 seconds. GM modules of about 2007-14 used B0020 for passenger frontal stage 2 instead, so check which bag the scan tool names. The airbag lamp is on.

Likely causes

Poor contact or corrosion at the side airbag connector or jumper harness under or in the seat
Internal fault in the left seat side airbag module
Pinched or chafed side airbag lead in the seat frame
Restraint module software reacting to interference, e.g. Toyota Tundra 2022 with wireless charger

Symptoms

  • Airbag warning lamp on
  • Left front side airbag may not deploy in a side impact
  • Safety note: do not probe the airbag circuit yourself; unplug airbag connectors only with the battery disconnected and the stated wait time observed

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

left side airbag modulesrs control modulesrs seat wiringseat harness connector

Related codes

B0028B0021B0030

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.