Code Definition

B2580 — Aux Blower Sense Switch Circuit Failure

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

About B2580

B2580 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 B2580 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 B2580 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 auxiliary blower sense switch provides a feedback signal to the climate control module or Body Control Module indicating the actual operating state of the auxiliary HVAC blower, typically the rear or second row blower used on vans, SUVs, and dual zone systems. DTC B2580 sets when the controlling module detects that the sense circuit voltage does not match the commanded blower state, either failing to go high when the blower is energised or remaining active when the blower is off. The sense input is usually monitored through a pull up reference inside the module, with the relay or blower lo...

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