Code Definition

B2561 — Aux A/C Blower Speed 1 Circuit Failure

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

About B2561

B2561 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 B2561 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 B2561 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 Climate Control Module monitors the operation of the auxiliary (rear) A/C blower motor to ensure each speed circuit is functioning correctly. DTC B2561 is set when the module detects a circuit failure on the speed 1 (typically the lowest speed) output to the auxiliary blower motor, indicating an open circuit, a short to ground, or a short to voltage on that specific speed control wire. The auxiliary blower system uses a blower resistor pack or solid state speed controller, with separate wires for each speed setting that route through the climate control switch and the auxiliary H...

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