Network, generic

U0174 Lost Communication With Restraints System Sensor E

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0174 refers to restraint sensor E, the fifth remote crash sensor in J2012 lettering. No manufacturer documents U0174 publicly. Chrysler's Jeep tables in NHTSA file PE11-019 go from U0173 straight to U0175, so slot E is simply not used there. Where it is fitted, such a sensor usually hangs on a two-wire PSI5 line that carries power and data at once: the control unit sends sync pulses and expects the reply in a fixed time slot, so an open wire, a short or a dead sensor shows up as missing frames. Before buying parts, check with a scan tool whether the airbag unit is really configured for sensor E; a replacement unit with the wrong coding can complain about sensors the car does not have. U0475 is the invalid-data partner. Airbag lamp on, no MIL.

Likely causes

Connector at sensor E loose, wet or corroded
Airbag unit coded for a sensor E that is not fitted (e.g. after unit replacement)
Two-wire sensor line open or shorted
Crash sensor E internally failed

Symptoms

  • Airbag warning lamp on
  • Scan tool lists sensor E as not responding
  • Deployment paths depending on sensor E may be blocked

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–600
Time0.5–2.5 h

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

Parts involved

restraints sensor ecrash signal wiring

Related codes

U0151U0173U0175U0475

References: static.nhtsa.gov, psi5.org, bosch-mobility.com.