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U0177 Lost Communication With Restraints System Sensor H

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0177 is stored when crash sensor H, the eighth remote sensor of the restraint system in J2012 lettering, stops reporting to the airbag control unit. Remote acceleration or pressure sensors detect front, side or rear impacts early and feed the central unit that decides on deployment. No manufacturer documents U0177 publicly. Chrysler's Jeep airbag list from 2006-2010 shows how the block is used, assigning U0170 to U0176 to front and side satellites, but ends before H; so U0177 only appears on vehicles with very many satellites. Siblings U0170 to U0176, U0178 and U0179 name the other sensor positions. Result: airbag warning lamp on, possibly reduced protection in one zone, no MIL. Leave airbag work to a workshop.

Likely causes

Connector at sensor H loose, wet or corroded
Sensor wiring damaged by trim or body work
Crash sensor H failed
Airbag control unit input faulty or wrong configuration

Symptoms

  • Airbag warning lamp on
  • Impact detection in the zone of sensor H unavailable
  • Code returns immediately after clearing

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–600
Time0.5–2.5 h

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

Parts involved

restraints sensor hcrash signal wiring

Related codes

U0151U0170U0176U0178U0179

References: bosch-mobility.com, bosch-mobility.com, static.nhtsa.gov.