Network, generic

U0480 Invalid Data Received From Seat Belt Pretensioner Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0480 mirrors U047F for seat belt pretensioner module B: the receiver gets its messages but finds them invalid, whereas U017F would mean silence. Honda's patent US 7,686,118 shows how such a unit is tied in: a dedicated electric belt controller drives the retractor motor, sits on the vehicle LAN, takes collision warnings from the brake control unit and receives the buckle signal routed through the airbag controller. With that many partners, bad data can come from the module itself or from inputs it relays. Autoliv's patent US 7,140,571 describes motor-driven reversible pre-crash tensioning. On 2025-2026 Audi models bulletin 2081251 records U017F00 beside U017E00. Comfort and pre-crash belt functions may switch off; no MIL.

Likely causes

Software fault in pretensioner module B or the unit sending it data
Faulty input relayed through the module, such as the buckle signal
Internal fault in the motorised retractor

Symptoms

  • Belt pre-tensioning or haptic belt warning unavailable
  • Restraint system warning message

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 b

Related codes

U017FU047FU017EU0452

References: patents.google.com, patents.google.com, static.nhtsa.gov.