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U0478 Invalid Data Received From Restraints System Sensor H

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0478 flags invalid data from restraints sensor H, the counterpart of lost-contact code U0177. No manufacturer publishes which sensor carries the letter H; the Chrysler fault tables filed with NHTSA under PE11-019 stop at G. An H implies at least eight satellites. Bosch's arithmetic allows that: besides acceleration satellites it wires two or four pressure sensors inside the door cavities, so four door sensors plus two side and two front acceleration sensors already add up to eight. Bosch's small AB light unit, with six sensor inputs at most, could not serve such a layout. Airbag lamp on, no MIL.

Likely causes

Moisture or a damaged seal affecting a door-mounted pressure sensor
Sensor line damaged, for example in a door hinge harness
Restraints controller coded for a sensor set that is not fitted

Symptoms

  • Airbag warning lamp on
  • Code present only in the restraints controller

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–600
Time0.5–3 h

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

Parts involved

restraints system sensor h

Related codes

U0177U0477U0479U0452

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