The B0110 code on your 2020 Subaru Outback indicates a fault in the right side (passenger) seat belt pretensioner circuit. This code affects your Outback's supplemental restraint system, signaling a problem with the passenger's seat belt pretensioning mechanism.
Understanding B0110 on Subaru Outback
Code B0110 is the passenger side counterpart to B0109. It indicates the airbag control module has detected an electrical fault in the passenger pretensioner circuit - this could be an open circuit, short circuit, or resistance out of specification.
Common Symptoms
- Airbag warning light illuminated
- Passenger seat belt works normally
- Pretensioner may not activate in crash
- No difference in normal seat belt operation
Primary Causes
- Passenger pretensioner unit failure
- Wiring damage under passenger seat
- Corroded connector at pretensioner
- Previous deployment not addressed
- Water damage to components
- Seat track mechanism damaging wiring
Diagnostic Procedure for 2020 Outback
SAFETY: Disable airbag system before any work. Using Subaru SSM4 or compatible scan tool, access passenger pretensioner circuit data. Inspect wiring under and beside the passenger seat. Check pretensioner connector condition at seat belt buckle anchor area. Verify pretensioner hasn't been deployed previously. Look for water damage signs or corrosion.
Repair Solutions
Replace pretensioner if previously deployed or internally failed. Repair damaged wiring carefully. Clean and reseat corroded connectors. Replace wiring harness sections if severely damaged. After repair, clear codes with Subaru scan tool and verify proper circuit status.