U0480 code meaning
Invalid Data Received From Seat Belt Pretensioner Module B
What U0480 means
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.
U0480 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0480
- Belt pre-tensioning or haptic belt warning unavailable
- Restraint system warning message
Common causes of U0480
- Most likelySoftware fault in pretensioner module B or the unit sending it data
- PossibleFaulty input relayed through the module, such as the buckle signal
- Less likelyInternal fault in the motorised retractor
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Seat belt pretensioner module b
What each part of U0480 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 80 | The exact fault in that area. |
What to do next
- Note U0480 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0480
What does U0480 mean?
U0480 means "Invalid Data Received From Seat Belt Pretensioner Module B". U0480 mirrors U047F for seat belt pretensioner module B: the receiver gets its messages but finds them invalid, whereas U017F would mean silence. It is a generic code, so it means the same on every make.
Is it safe to drive with U0480?
U0480 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0480 fail an emissions test?
U0480 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0480 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0480 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.