Code Definition

B0104 — Electronic frontal impact sensor signal error

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

About B0104

B0104 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 B0104 is stored, the module has detected 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 B0104 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 (ACM) uses one or more electronic frontal impact sensors, which are satellite accelerometers mounted in the front of the vehicle, to confirm the severity and timing of a frontal collision before it commands the front airbags and pretensioners. DTC B0104 sets when the ACM detects an abnormal, invalid, or out of range signal from one of these frontal impact sensors, which may be caused by a faulty sensor, an open, short, or high resistance condition in the sensor circuit, a poor connection, or an internal ACM fault reading the signal. Because these sensors sit in the fr...

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