U0178Lost Communication With Restraints System Sensor I
- Generic OBD-II code · Network
- How the car detects it
- U0178 covers restraint sensor I, the ninth remote crash sensor; unlike many letter series, J2012 does use the letter I here. No manufacturer documents U0178 publicly. High sensor counts come mainly from combining sensor types: Bosch connects two or four door pressure sensors to the airbag unit in addition to the acceleration sensors on the body structure, so a four-door car can easily exceed eight satellites. A pressure sensor in the door cavity registers the pressure rise when the door is pushed in. Its wiring passes through the door hinge area, where repeated opening can break conductors, and water inside the door can reach the connector. Such sensors are often linked via PSI5, a two-wire interface. U0479 reports invalid data from the same sensor. No MIL.
- What you may notice
- Airbag warning lamp on
- Fault may come and go with door movement
- Impact detection in the zone of sensor I unavailable
- Likely causes
- LikelyBroken wire in the door hinge passage
- PossibleWater inside the door at the sensor connector (failed vapour barrier)
- PossibleSensor I failed
- RareSensor interface of the airbag unit faulty
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.