U047FInvalid Data Received From Seat Belt Pretensioner Module A
- Generic OBD-II code · Network
- How the car detects it
- 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.
- What you may notice
- Warning that proactive occupant protection is faulty
- No belt pre-tensioning during hard braking
- Airbag or restraint warning possible
- Likely causes
- LikelySoftware fault in the belt pretensioner module or its bus partner
- PossibleSupply or bus wiring fault at the retractor in the B-pillar or seat
- RareInternal fault in the motorised retractor module
- Repair
- Hard · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.