Code Definition

B2440 — Passenger Side, Side Crash Sensor Mount Fault

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

About B2440

B2440 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 B2440 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 B2440 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 uses side impact sensors mounted in the vehicle body to detect lateral collisions and trigger side air bag deployment. The passenger side crash sensor is bolted to a specific mounting location chosen for its crash response signature, and the restraint module monitors mount integrity using sensor rest values and self test data. DTC B2440 is set when the module detects the passenger side crash sensor is not securely mounted in its intended position, evidenced by abnormal rest readings, loss of expected mechanical coupling, or a sensor self test failure related t...

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