Code Definition

B2348 — Mirror Switch Reference Voltage Positive Common Supply Voltage Fault

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

About B2348

B2348 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 B2348 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 B2348 code indicates a general voltage fault on the mirror switch reference voltage positive common circuit, meaning the reference rail is outside the expected operating window without the module distinguishing between an open, a short to ground, or a short to vehicle voltage. 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 continuously monitors the rail. When the supply voltage drifts outside the acceptable range, the module sets this fault. The driver typica...

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