All Body Airbag DTC Codes — Complete OBD-II Diagnostic Guide (2026)
This comprehensive reference covers every Body Airbag diagnostic trouble code (DTC) — 2 codes total. Each code includes what triggers it, common symptoms, step-by-step diagnostic procedures, and repair guidance.
Detailed DTC Code Guides
B0100: The B0100 code signals a fault in the Electronic Frontal Sensor 1, the primary detector for frontal impacts that tells the airbag control module when to fire. Typical triggers are a damaged sensor, corroded wiring, or a loose connector.
Learn what B0100 means, why the airbag light is on, and how to fix the Electronic Frontal Sensor 1 malfunction. DIY steps, cost estimates, safety warnings,...
- Quick Visual Inspection
- Check for Obvious Issues
- Inspect Sensor Wiring
- ...see all 6 steps →
B1000: The B1000 code signals that the air‑bag control unit (ECU) has detected an internal fault and cannot perform its safety functions. The error is stored as a permanent DTC.
What the B1000 code means, why it shows on Toyota, Honda, Ford and Chevrolet, and how to diagnose and fix it. Step‑by‑step checks, safety warnings, cost...
- Visual Inspection
- Live Data Scan
- Self‑Test
- ...see all 5 steps →
Understanding Body Airbag Codes
Body Airbag diagnostic trouble codes are set by your vehicle's onboard computer (ECU/PCM) when it detects a problem in the airbag system. Here's what you need to know:
- How codes are triggered: Sensors monitor airbag performance. When readings fall outside expected ranges, the ECU stores a DTC and illuminates the check engine light.
- Freeze frame data: When a code is set, the ECU also records engine conditions at that moment. This data helps pinpoint the exact cause.
- Pending vs. confirmed: A code becomes "confirmed" after multiple drive cycles with the same fault. Pending codes may clear on their own.
Tools You'll Need for Diagnosis
- OBD-II scanner — Essential for reading and clearing codes. A basic scanner works for most codes.
- Digital multimeter — For testing sensor voltages, resistance, and continuity.
- Repair manual — Vehicle-specific wiring diagrams and specifications.
- Safety equipment — Gloves, safety glasses, jack stands for under-vehicle work.
When to See a Mechanic
While many airbag codes can be diagnosed at home, see a professional if:
- The code is critical severity — driving may cause further damage
- Multiple related codes are present — suggests a deeper systemic issue
- You don't have the tools or experience for the required diagnostic steps
- The repair involves fuel system, exhaust, or catalytic converter work