Code Definition

B013B — Left Rear Impact Sensor

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

About B013B

B013B 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 B013B 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 B013B 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 Supplemental Restraint System (SRS) control module monitors the left rear side impact sensor, which is typically a satellite accelerometer or pressure sensor mounted in the left rear door, quarter panel, or B/C pillar area. The sensor communicates with the SRS module over a dedicated two-wire circuit and reports deceleration or pressure data so the module can make rapid deployment decisions in a side-impact event. DTC B013B is set when the SRS module detects an electrical fault in the left rear impact sensor circuit — an open, short to ground, short to power, high resistance, or an inval...

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