U0172Lost Communication With Restraints System Sensor C
- Generic OBD-II code · Network
- How the car detects it
- U0172 marks a lost link to restraint sensor C. Chrysler uses it for the first left side satellite acceleration sensor in the Jeep tables of NHTSA file PE11-019. The Wrangler JK has just this one sensor on each side, whereas Compass/Patriot, Liberty, Grand Cherokee and Commander add a second left unit reported as U0173. Bosch fits side sensors of this type to load-bearing parts such as sills, seat cross members and the B- or C-pillar, because a side impact leaves almost no crush space and the airbag unit must decide within a few milliseconds. With sensor C missing, left side and curtain airbag deployment may be degraded. An internal fault of the sensor appears as B1B72 instead. Water in the footwell or seat removal are typical triggers. No MIL.
- What you may notice
- Airbag warning lamp on
- Left side and curtain airbag deployment may be impaired
- Fault can be intermittent with wet carpets or after rain
- Likely causes
- LikelyWater in the left footwell or sill area reaching the sensor connector
- PossibleConnector disturbed during seat, carpet or trim removal
- PossibleLeft side satellite sensor failed after a side knock
- RareAirbag control unit input or configuration faulty
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.