Code Definition

B2347 — Mirror Switch Reference Voltage Positive Common Supply Low Voltage

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

About B2347

B2347 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 B2347 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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 B2347 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 B2347 code indicates that the mirror switch reference voltage on the positive common circuit has fallen below the lower voltage threshold expected by the monitoring module. The driver door module or body control module supplies a regulated 5V reference shared across the directional and mirror select switches inside the door mirror switch assembly and monitors that supply for nominal voltage. When the supply is pulled down, typically by a short to ground or excessive parasitic load on the reference rail, every mirror switch input becomes unreliable and the module sets this fault. The driver...

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