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U017E Lost Communication With Seat Belt Pretensioner Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U017E reports that seat belt pretensioner module A no longer communicates. Such modules drive electric, reversible belt tensioners: Audi pre sense pulls the front belts tight by small motors when it senses emergency braking or skidding and releases them if no crash follows. On the 2015 A3, the airbag unit J234 runs the left and right tensioner modules J854/J855 over LIN; the pyrotechnic tensioners are separate. Audi bulletin 2081251 (2025-26 A5, A6, Q5, Q6 e-tron) asks for a report when U017E00 and U017F00 come with a proactive occupant protection fault message. Stellantis calls the U017E partner seatbelt sensor 1 in PCM-update bulletins for the 2021 300, Charger and Challenger, there with a lit MIL.

Likely causes

Connector at the belt retractor module in the pillar loose or damaged
New retractor with control module not coded or basic setting not done
Harness damaged or wrongly routed (Jeep JL, shifter area)
Software issue in the module or a listener such as the PCM (FCA 2021)

Symptoms

  • Warning message for pre-crash occupant protection
  • Belt no longer pre-tightened during emergency braking
  • Airbag lamp on; on some FCA models MIL as well

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 acan buslin bus

Related codes

U0151U017FU047F

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.