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U017F Lost Communication With Seat Belt Pretensioner Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Retractor with control module replaced but not coded or basic-set
Supply or bus connector at module B loose
Pretensioner module B internally faulty
Bus line between airbag unit and module B damaged

Symptoms

  • Pre-crash protection fault message in the instrument cluster
  • Reversible belt tightening on one seat inoperative
  • Often stored together with U017E

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

seatbelt pretensioner bcan buslin bus

Related codes

U0151U017EU0480

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, audi-technology-portal.de.