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U0173 Lost Communication With Restraints System Sensor D

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0173 tells that the airbag control unit no longer receives data from remote crash sensor D. Such satellite sensors sit in the crumple zone, doors or pillars and report acceleration in one or two axes so the control unit can judge direction and severity of an impact. Chrysler documents the code: in its 2006-2010 Jeep airbag code list U0173 stands for the second left-side satellite acceleration sensor, beside U0170/U0171 (front left/right), U0172 (left side 1) and U0175/U0176 (right side). Which position letter D has on other makes is their choice. The airbag warning lamp lights, protection on that side may be reduced, and there is no MIL. Diagnosis and repair belong to trained staff only.

Likely causes

Loose or corroded connector at satellite sensor D
Sensor line damaged, e.g. in the door or pillar area
Satellite sensor D failed (water ingress, impact)
Sensor input of the airbag control unit faulty

Symptoms

  • Airbag warning lamp on
  • Side impact detection on the affected side reduced
  • Code stays active until the sensor link is restored

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 dcrash signal wiring

Related codes

U0151U0170U0171U0172U0174U0175U0176

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