Code Definition

B2227 — Front Crash Sensor Driver Communications Fault

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

About B2227

B2227 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 B2227 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 B2227 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 communicates with the front crash sensor on the driver side over a dedicated digital communication line, exchanging accelerometer data and status messages at high speed. DTC B2227 sets when the SRS module loses communication with the driver side front crash sensor, receives corrupted or invalid messages, or detects a checksum or framing error on the data link. The sensor typically uses a single wire current modulated communication protocol such as PAS3 or similar, where the SRS module supplies power and the sensor returns data by modulatin...

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