B0110 B0xxx · Body (B) High severity
Seat Belt Pretensioner Circuit Fault
A fault in the pyrotechnic or electric seat belt pretensioner circuit. The belt will not tighten correctly in a crash.
Severity guidance: High — stop driving and diagnose now; risk of further damage
Symptoms you will notice
- Airbag or belt warning lamp
- Belt does not retract normally if electric
Common causes
Ordered from most to least likely — start at the top.
- 1 Open circuit in the pretensioner
- 2 Connector under the seat disturbed
- 3 Previously deployed unit
- 4 Wiring damage
How to diagnose it
Cheapest and least invasive first — most of these codes are not a parts problem.
- ✓ Follow the airbag safety procedure before any testing.
- ✓ Read loop resistance from the restraint ECU.
- ✓ Inspect the seat connector and wiring.
- ✓ Check whether the vehicle has been in a previous collision.
Repair options
- Replace the pretensioner assembly
- Repair the wiring or connector
B0110 — frequently asked questions
Are pretensioners reusable after deployment? +
No. They are single-use pyrotechnic devices.
Can I drive the car? +
You can move it, but the restraint system is compromised. Repair before normal use.
Confirm the diagnosis before you buy parts
Send us the code, freeze-frame data and the vehicle — our engineers will tell you what to test first.