Code Definition

B0091 — Active switch in incorrect state

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

About B0091

B0091 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 B0091 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) monitors an active switch input, typically the passenger airbag deactivation (PAD) switch, and expects the switch to remain in a valid state consistent with normal vehicle operation. DTC B0091 sets when the ACM sees a switch state that is electrically valid (that is, the voltage is inside one of the two normal ranges) but is not what the ACM expects for the current operating conditions. Common examples are the switch changing state while the ignition is off with no valid key input, the switch state disagreeing with a second redundant contact set inside the same ...

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