Code Definition

B2725 — Transfer Case Range Selection Switch Circuit

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

About B2725

B2725 is a generic (obd-ii standard) body diagnostic trouble code recorded for Holden vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2725 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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 B2725 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 relates to the four wheel drive mode selection circuit between the dash mounted transfer case range selection switch and the Transfer Case Control Module (TCCM). The TCCM supplies a regulated 5 volt reference to the switch, and each switch position (2H, 4H and 4L) places a different resistance into the signal return circuit so the module can identify which range the driver has requested. B2725 sets when the module reads a signal voltage that does not correspond to any valid switch position, or reads two positions as selected at once, usually because of a failed switch, a corroded con...

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