Code Definition

B0020 — Passenger Frontal Stage 1 Deployment Control

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

About B0020

B0020 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.

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 B0020 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

This code is logged by the Supplemental Restraint System (SRS) control module when a fault is detected in the Stage 1 deployment circuit of the passenger frontal airbag. The control module monitors the deployment loop for correct resistance. If the resistance is too high (open circuit), too low (short), or outside the expected range due to a short to ground or to voltage, the fault is set. This check occurs at key on and continuously during vehicle operation. When this code is stored the airbag warning lamp illuminates and the SRS module will usually disable deployment of the affected circuit,...

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