Code Definition

B0101 — Electronic front end sensor signal out of range - sensor 1

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B0101

B0101 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B0101 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B0101 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The airbag control module, also called the sensing and diagnostic module (SDM), monitors the electronic front end crash sensor (sensor 1), a forward mounted accelerometer that measures frontal impact severity to help decide front airbag and pretensioner deployment. DTC B0101 sets when the module receives an out of range or not valid signal from this front end sensor, which can result from a faulty sensor, an open, short, or high resistance condition in the sensor wiring, or an internal module fault in reading the signal. Because the sensor is mounted at the front of the vehicle it is exposed t...

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