Network, generic

U047F Invalid Data Received From Seat Belt Pretensioner Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U047F concerns seat belt pretensioner module A, a belt retractor with its own motor and electronics rather than a purely pyrotechnic tensioner fired by the airbag unit. Such reversible retractors take up slack before a possible crash, during emergency braking or evasive steering, and can warn by pulsing the strap, as ZF LIFETEC describes for its ACR8. A receiver stores U047F when this module's messages are corrupt or implausible; U017E is lost contact. On 2025-2026 Audi Q5, Q6 e-tron, A5 and A6 models, bulletin 2081251 shows the partner code together with U017F and a proactive occupant protection fault. FCA calls U017E seatbelt sensor 1 in bulletin 18-013-22. Pre-crash belt tensioning may be unavailable; no MIL.

Likely causes

Software fault in the belt pretensioner module or its bus partner
Supply or bus wiring fault at the retractor in the B-pillar or seat
Internal fault in the motorised retractor module

Symptoms

  • Warning that proactive occupant protection is faulty
  • No belt pre-tensioning during hard braking
  • Airbag or restraint warning possible

Repair estimate

DifficultyHardWorkshop job
Parts and labour€0–1,200
Time0.5–3 h

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

Parts involved

seat belt pretensioner module a

Related codes

U017EU0480U017FU0452

References: zf-lifetec.com, static.nhtsa.gov, static.nhtsa.gov.