U017FLost Communication With Seat Belt Pretensioner Module B
- Generic OBD-II code · Network
- How the car detects it
- U017F is the second pretensioner module code: module B has dropped off its link to the airbag unit. Audi documents it together with U017E00 in bulletin 2081251 for 2025-26 A5, A6, Q5 and Q6 e-tron models, where both codes accompany a proactive occupant protection warning and dealers are asked to file a case report. Two such modules are typical because each front seat gets its own motorised retractor, as on the 2015 A3 with J854 and J855. Keep U017F apart from Audi's B130474/B130574: those describe a deviating tensioning actuator, not a lost link. If a retractor with control unit was replaced after a collision, Audi requires a basic setting with the scan tool. Pyrotechnic pretensioners are wired separately. No MIL.
- What you may notice
- Pre-crash protection fault message in the instrument cluster
- Reversible belt tightening on one seat inoperative
- Often stored together with U017E
- Likely causes
- LikelyRetractor with control module replaced but not coded or basic-set
- PossibleSupply or bus connector at module B loose
- PossiblePretensioner module B internally faulty
- RareBus line between airbag unit and module B damaged
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.