U0171Lost Communication With Restraints System Sensor B
- Generic OBD-II code · Network
- How the car detects it
- U0171 says the airbag control unit receives nothing more from restraint sensor B. Chrysler documents it as the up-front right satellite acceleration sensor, the mirror image of U0170, in each Jeep airbag listing it supplied for investigation PE11-019, starting with the 2007 Wrangler; an internal defect of that unit is logged separately as B1B71. Front satellites of this kind sit inside the crumple zone. Bosch notes that they sharpen frontal crash detection beyond what the sensors inside the central unit can do, so without B the decision for the right half rests on less information. The location is exposed to spray, salt and collision damage, so after front-end body work an unplugged or wet connector is the first suspect. Other makes may give B another position. Airbag lamp on, no MIL.
- What you may notice
- Airbag warning lamp on
- Frontal impact sensing on the right side relies on the central unit only
- Code comes back immediately after clearing while the fault persists
- Likely causes
- LikelyConnector of the right front sensor not reconnected after bumper or front-end work
- PossibleWater or road salt in the sensor connector at the front
- PossibleFront satellite sensor B damaged in a collision
- RareSensor line to the airbag unit open or shorted
- 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.