B0101
Front Crash Sensor Circuit Malfunction
A fault has been detected in the front crash sensor circuit, used to detect frontal impacts and trigger airbags/pretensioners.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Common causes
Ordered by how often each turns out to be the cause.
- Sensor damaged after minor impactCommon
- Corroded sensor connector behind bumperPossible
Parts involved
- Front Crash Sensor
- Srs Control Module
B0101 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.