U017CLost Communication With Restraints System Sensor M
- Generic OBD-II code · Network
- How the car detects it
- U017C is stored once restraint sensor M, the thirteenth remote crash sensor, falls silent. No manufacturer documents U017C publicly. For diagnosis it matters whether the code is current or only stored: according to the PSI5 working group, a brief drop in supply makes a sensor restart and send initialisation data first, so a loose contact can leave a history entry without a lasting fault. Wiggle tests on the connector and harness while watching live status are therefore more useful than replacing parts. Mechanical fit counts too: Audi, for example, inserts its capacitive door pressure sensors into the inner door panel with a seal and turns them to lock, and a poorly seated sensor after trim work can fail. U047D reports invalid data instead of silence. No MIL.
- What you may notice
- Airbag warning lamp on or flickering
- Code stored as history after the lamp went out again
- Impact detection in the zone of sensor M unavailable while active
- Likely causes
- LikelyIntermittent contact at sensor M connector (history code)
- PossibleSensor not seated or sealed correctly after trim work
- PossibleSensor wiring chafed or open
- RareCrash sensor M failed
- 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.