Code Definition

B2472 — Fog Lamp Switch Failure

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

About B2472

B2472 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 B2472 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 Body Control Module (BCM) or Smart Junction Box (SJB) monitors the fog lamp switch input which signals when the driver requests fog lamp operation. DTC B2472 sets when the BCM detects a failure in the fog lamp switch circuit, typically a stuck signal where the switch reads as continuously closed or continuously open, a value outside the expected voltage range, or a short to power or ground that prevents reliable switch state detection. The fog lamp switch on most vehicles is a momentary or latching push switch integrated into the headlamp switch assembly or stalk, providing a ground or ref...

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