Body, generic

B0001 Driver Frontal Stage 1 Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The restraint control module tests the firing loop of the first inflator stage in the driver airbag, which sits in the steering wheel hub and is fed through the clock spring. B0001 is stored when that loop is open, shorted or outside its resistance window; the fault byte added to the code names the exact type. Mercedes-Benz logs B000113 for an open stage 1 squib, Honda used B0001-13 on the 2013 Civic, Mitsubishi files it under the driver airbag module, FCA under squib 1, and GM on its 2020-21 full-size trucks, where B0001-1B came from rust particles at the airbag connector raising the resistance (bulletin 21-NA-005). Stage 1 is the charge used in every deployment, so a fault here can cost the driver frontal protection. The airbag warning lamp stays lit.

Likely causes

Corroded or poorly seated connector between steering wheel harness and airbag module
Broken or worn conductor in the clock spring
Internal fault in the driver airbag module (stage 1 squib)
Chafed lead in the steering wheel or column harness

Symptoms

  • Airbag warning lamp or service airbag message stays on
  • Driver frontal airbag may not deploy in a crash
  • 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€150–1,200
Time1–3 h

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

Parts involved

driver airbag moduleclock springsrs wiringsrs control module

Related codes

B0002B0003B0010

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, mitsubishitechinfo.com.