Body, generic

B0047 Left Curtain Deployment Loop Short to Ground

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0047 is missing from the accessible J2012 lists as well, and no vehicle maker or NHTSA bulletin documents it, so it is not publicly traceable. The title names a grounded left curtain airbag loop; this inflatable curtain covers the side windows in side impacts and rollovers. Under J2012 this fault is normally stored as B0021 with byte 11: Mitsubishi sets B0021-11 once the left curtain circuit has been grounded for 2 seconds. GM Global A uses B0016 02 for a grounded left roof rail airbag loop, also after 2 seconds. A grounded lead often sits where the roof harness passes sharp body edges or trim clips. Airbag lamp on.

Likely causes

Insulation of the curtain lead chafed through against the body
Lead pinched by a pillar trim or headliner clip
Internal short to housing in the left curtain airbag

Symptoms

  • Airbag warning lamp on
  • Left curtain airbag deployment may be blocked
  • 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€100–1,000
Time1–4 h

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

Parts involved

left curtain airbagsrs roof wiringsrs control module

Related codes

B0046B0021B0029

References: mitsubishitechinfo.com, saabwisonline.com, autoliv.com.