B01xx codes: airbag crash sensors
1 code in this range, all generic — the same meaning on every make. The supplemental restraint system: front, side and knee airbags, seat-belt pretensioners and crash sensors. The airbag warning lamp comes on with these codes.
What usually causes codes in this area
- A connector under a seat that was knocked loose or has corroded
- A worn clock spring in the steering column (driver airbag circuits)
- A failed crash sensor
- A module fault, or crash data stored after a collision
Can you keep driving?
The car drives normally, but the airbags or pretensioners may not deploy in a crash — get it fixed promptly. Don’t unplug or probe airbag parts yourself: they can go off.
All B01xx codes
| Code | Meaning |
|---|---|
| B0100 | Electronic Front End Sensor 1 |
Read the codes from your own car
Plug an inexpensive Bluetooth LE or Wi-Fi OBD2 adapter into the port under the dashboard, and Brimly on your iPhone reads the stored, pending and permanent codes, explains each one offline and clears them once the fault is fixed. OBD diagnostics are part of Brimly Forever, a one-time purchase.
Requires iOS 18.1 or later. Free to download, with optional in-app purchases.