B0001 indicates the airbag sensing and diagnostic module has detected an electrical fault in the driver’s frontal airbag first-stage (Stage 1) deployment circuit. This circuit runs from the module through the steering-column harness and clock spring to the driver airbag inflator. A fault can prevent the driver airbag from deploying in a crash and will normally illuminate the SRS/airbag warning lamp.
The ribbon cable inside the steering-column clock spring flexes with every turn of the wheel and is the most common source of an open, high resistance, or intermittent connection in the driver airbag loop.
Chafing, pin corrosion, terminal spread, or harness damage between the airbag module and the steering wheel can disrupt the low-current deployment circuit.
An open or out-of-spec resistance inside the first-stage inflator itself can set the code, though this is less common than clock-spring or harness faults.
The two-wire deployment circuit can short to chassis ground, battery voltage, or to another airbag circuit, causing the module to flag the loop as unsafe.
The sensing and diagnostic module can have an internal fault, but this is relatively rare and should only be suspected after the inflator, clock spring, and wiring have been tested.
The vehicle will usually drive normally, but the driver’s frontal airbag may not deploy in a collision, so the safety system should be repaired as soon as possible.
The module normally disables the affected deployment loop when a fault is detected, which reduces the chance of unintended deployment; however, a short to voltage can still create a hazardous condition and should be diagnosed promptly.
No. The module is one of the least likely causes. Most B0001 faults are due to the clock spring, wiring, or the inflator itself. The control module should only be replaced after those components have been ruled out.
Many generic scanners only read engine/powertrain codes. A scan tool with SRS or airbag-system capability is usually needed to read, record, and clear B0001.